Introduction

The Hayward Pool Products Hot Tub Heater H500FD is a high-performance gas heater designed to provide rapid heating for your spa or hot tub. With a powerful 500,000 BTU output, it ensures quick temperature adjustments, allowing you to enjoy your hot tub without long wait times. Built with a durable cupro-nickel heat exchanger, the H500FD offers exceptional resistance to corrosion. Priced at approximately $2,199.00, this heater combines efficiency and reliability for year-round comfort.

Specifications

The Hayward H500FD Hot Tub Heater boasts several key features that make it an excellent choice for heating your hot tub:

High-efficiency heating: The H500FD uses advanced technology to provide maximum heating efficiency, reducing energy costs.
Corrosion-resistant design: Built with durable materials, this heater is resistant to corrosion and can withstand harsh environmental conditions.
Electronic ignition: Ensures safe and reliable ignition, eliminating the need for a pilot light.
Compact design: Perfect for installations where space is limited.
Universal compatibility: Can be used with various types of hot tubs and pools.

Description

The Hayward H500FD Hot Tub Heater is a powerful and efficient heating solution designed to keep your hot tub at the perfect temperature. With its electronic ignition system, this heater offers a safe and reliable way to heat your water without the continuous burn of a pilot light. The corrosion-resistant design ensures long-lasting performance, even in harsh environments. The compact size makes it ideal for installations where space is a concern, yet it packs enough power to quickly and efficiently heat your hot tub.

This heater is also environmentally friendly, as it operates with high efficiency and reduces energy consumption compared to traditional heaters. Whether you're looking to enhance your home spa experience or ensure consistent temperatures in a commercial setting, the Hayward H500FD is an excellent choice.

INSTALLATION

EQUIPMENT INSPECTION:
On receipt of the heater, inspect the heater carton(s) for damage. If any carton(s) is damaged, note it when signing for it. Remove the heater from the carton(s) inspect it and advise the carrier of any damages at once.

Important notice: The installation instructions are intended for the use of a qualified technician, specifically trained and experienced in the installation of this type of heating equipment. Some states or provinces require that installation be licensed. If this is the case in the state or province where heater is located, the contractor must be properly licensed.

WARNING: Failure to comply with the appliance and vent package installation instructions and service instructions in this manual may result in equipment damage, fire, asphyxiation, or carbon monoxide poisoning. Exposure to products of incomplete combustion (carbon monoxide) can cause cancer and birth defects or other reproductive harm.

Conformance with codes:
The heater shall be installed in accordance with all local and state codes. The heater installation must conform to the latest edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54) and with the requirements of the authority having jurisdiction. Design certification of the heater is in compliance with ANSI Z21.56/CSA 4.7. For Canadian installations, the heater is to be installed in accordance with the standards CAN/CGA B149.1 and B149.2 – Installation Codes for Gas Burning Appliances and Equipment and/or local codes and, if applicable, CSA C22.1 – Canadian Electrical Code, Part I.

Altitude of installation :

Heaters may be installed at any altitude up to 10,100 ft above sea level, provided the appropriate modification(s) are performed. The altitudes which require modification vary depending on the model. Parts necessary to convert the heater for outdoor installation at altitudes up to 7,700 ft (minimum) are included with the heater.

Conversion is accomplished by replacement of the blower air inlet plate, and for indoor applications, installation of the appropriate vent pressure switch. The blower air inlet plates are clearly marked with the compatible heater model(s), vent configuration(s), and altitude range(s). Care should be taken to verify the correct plate and vent pressure switch is being used to ensure proper heater performance. The vent pressure switch should be provided with the indoor adapter kit, or if you have an older indoor adapter kit, order p/n FDXLVPS1931 for the high-altitude indoor vent pressure switch.

High-Altitude Conversion Procedure:

Identify the altitude of the installation site. This may be done using a GPS device, or by looking up the altitude for the geographic location. Altitudes for all locations in the United States and Canada may be found using the zip/postal code database at www.zip-codes.com. If the altitude for the installation site is greater than 10,100 ft, the heater may not be installed. Note that if installing outdoors, some Universal H-Series heaters may be compatible with your altitude without modification. Table 1 lists the altitude ranges for heaters without modification. All indoor heaters installed above 2,000 ft require a special vent pressure switch.
Select the appropriate blower air inlet plate to use based on the heater model, vent configuration (outdoor or indoor), and altitude needed. Extra plate(s) are included with the heater, packaged in the plastic bag with this manual. Each plate has a label which identifies which model(s), vent configuration(s), and altitude range(s) for which it is designed. Table 1 lists the maximum installation altitudes using the included conversion plate(s). If installing above 7,700 ft, the high-altitude kit FDXLHAK1930 (sold separately) may be necessary.
If installing indoors, select the appropriate high-altitude indoor vent pressure switch from the indoor adapter kit or from the FDXLVPS1931 kit. Each switch has a label which identifies which model(s) and altitude range(s) for which it is designed.
If connected, turn pump, main gas valve, and heater power off.
Remove heater front access door.
Remove the 4 #10 hex head screws that fasten the blower air inlet plate to the blower, and remove the blower air plate and discard. Save the 4 screws as they will be needed to install the new plate. See Figure 26 (page 47).
Install the appropriate blower plate from the kit using the 4 screws. It may be helpful to drive the screws in and out of the plate outside of the heater first to “thread” the holes before installing it in the heater.
If the installation is configured for indoor venting, a special high-altitude vent pressure switch must be installed. Follow the instructions for vent kit installation (page 17), but use the appropriate blower air inlet plate and vent pressure switch for your altitude.
Re-install heater front door.
If connected, turn pump, main gas valve, and heater power back on.
Activate heater and check for proper function.

Table 1 lists the maximum altitudes for which each model is designed with:

no modifications,
the included conversion plate installed, and
the accessory conversion kit FDXLHAK1930 installed (sold separately).

TABLE 1

Heater Model	Gas	Maximum Installation Altitude
		Outdoor Installation			Indoor Installation *
		No Modifica- tions to Heater	Included Con- version Plate Installed on Heater	Conversion kit FDXLHAK1930 Installed on Heater	No Modifica- tions to Heater	Included Con- version Plate Installed on Heater	Conversion kit FDXLHAK1930 Installed on Heater
H150FDN	NAT	7,700 ft	N/A	10,100 ft	10,100 ft	N/A	N/A
H150FDP	LP	7,700 ft	N/A	10,100 ft	2,000 ft	10,100 ft	N/A
H200FDN	NAT	10,100 ft	N/A	N/A	10,100 ft	N/A	N/A
H200FDP	LP	5,400 ft	10,100 ft	N/A	2,000 ft	10,100 ft	N/A
H250FDN	NAT	5,400 ft	10,100 ft	N/A	2,000 ft	10,100 ft	N/A
H250FDP	LP	2,000 ft	7,700 ft	10,100 ft	2,000 ft	7,700 ft	10,100 ft
H300FDN	NAT	10,1001 ft	N/A	N/A	10,100 ft	N/A	N/A
H300FDP	LP	2,000 ft	10,100 ft	N/A	2,000 ft	10,100 ft	N/A
H350FDN	NAT	2,000 ft	10,100 ft	N/A	2,000 ft	10,100 ft	N/A
H350FDP	LP	2,000 ft	7,700 ft	10,100 ft	2,000 ft	7,700 ft	10,100 ft
H400FDN	NAT	10,100 ft	N/A	N/A	10,100 ft	N/A	N/A
H400FDP	LP	2,000 ft	7,700 ft	10,100 ft	2,000 ft	7,700 ft	10,100 ft
H500FDN	NAT	10,100 ft	N/A	N/A	10,100 ft	N/A	N/A
H500FDP	LP	5,400 ft	7,700 ft	10,100 ft	5,400 ft	7,700 ft	10,100 ft

All indoor installations at altitudes above 2,000 ft require a vent pressure switch to be installed in addition to the blower inlet plate. The vent pressure switch is included with the appropriate indoor vent kit (UHXNEGVT1xxx or UHX-POSHZ1xxxx), or the high-altitude vent pressure switch kit FDXLVPS1931.

Uncrating the heater

To remove the shipping carton from the heater:

Remove the corrugated carton from the heater. The carton, top pad, bottom pad, and the four corner posts can be recycled.
There are three (3) screws total used to secure the heater to the wood pallet. All three must be removed to separate the heater from the pallet. One (1) is located in the lower rear of the heater as shown in Figure 1.
To access the other two (2) screws, open the front access panel by removing the black phillips-head screw. Then remove the two (2) screws which hold the heater base pan to the pallet as shown in Figure 2.
Lift the heater clear of the corrugated bottom pad and off of the pallet.

ATTENTION: Do not drop the heater from a pickup truck tailgate to the ground. This may damage the heater.

Locating the heater

Locate the pool/spa/hot tub heater in an area where leakage of the heat exchanger or connections will not result in damage to the area adjacent to the heater or to the structure. When such locations cannot be avoided, it is recommended that a suitable drain pan, with drain outlet, be installed under the heater. The pan must not restrict airflow.
This heater must be installed at least (5) feet from the inside wall of a pool (in-ground or above-ground)/ spa/hot tub unless separated from the pool/spa/hot tub by a solid barrier.
The heater must be installed such that the location of the exhaust gas vent assembly outlet relative to adjacent public walkways, adjacent buildings, openable windows, and building openings complies with the National Fuel Gas Code (ANSI Z223.1/NFPA 54) and/or CAN/CGA B149 installation codes.

Outdoor installation and service clearances:
The heater must be installed outdoors such that the installation and service clearances from combustible materials shown in Table 2 are maintained. This heater may be installed on combustible floors.

The heater is self-venting when installed outdoors and does not require additional vent piping.
Do not install in a location where growing shrubs may in time obstruct a heater’s combustion air and venting areas.
Do not install this appliance under an overhang less than (3) feet from the top of the appliance. The area under the overhang must be open on (3) sides.
Do not install the heater where water spray from ground sprinkler can contact the heater. The water could splash on the controls causing electrical damage.
Do not install under a deck.
Do not install within 24” of any outdoor HVAC equipment.
Do not install where water may run-off a roof into the heater. A gutter may be needed to protect the heater.
Any enclosure around the heater must provide a combustion air vent commencing within 12 inches of the bottom of the enclosure. The vent opening shall have a minimum free area of 1 square inch per 4,000 Btu/hr input rating of all gas appliances in the enclosure. See Table 5.
If the heater is to be installed in front of an exterior wall with vinyl siding, increase the clearance from the back of the unit shown in Table 2 to 12 inches.
Table 2 Outdoor Installation Clearances
Heater Panel Required Clearance
Top Unobstructed
Front 18 inches
Back 6 inches
Water Connection Side 12 inches
Side Opposite Water Connec- tion 6 inches
For minimum exhaust vent clearances for all building openings, including but not limited to vented eaves, doors, windows, or gravity inlets, see Figure 3. In Canada, the heater must be installed with the top of the vent at least 10 feet (3m) below, or to either side of, any opening into a building.

Flooring:

This heater may be installed on either non-combustible or combustible flooring. Ultralite™ or equivalent concrete-over-foam HVAC pads are acceptable.

Tie-down brackets:
The heater is equipped for installation of factory-supplied tie-down brackets if required by local codes. The brackets are shipped in the consumer kit. You will need the following to complete the installation:

Tie-down brackets (factory-supplied , quantity = 4)
Sheet metal screws (factory-supplied , quantity = 4)
Concrete tapping screws (Tapcons) (field-supplied, stainless steel, quantity = 4, size to be ¼” diameter with a minimum length of 1-1/2”)
Fender washers (field supplied, stainless steel, quantity = 4, size to be 1-1/2”)

Installing tie-down brackets:

Locate the tie-down brackets and the sheet metal screws.
Obtain the Tapcons. Be sure the overall length of the concrete tapping screw is at least 1-1/2”.
Remove the front access panel (1 screw).
Remove the rear access panel (4 screws).
Position the heater on the pad so that all Tapcons can “bite” into the pad. Observe local codes regarding pad construction, some jurisdictions specify a minimum thickness for concrete pads.
Slip the tie-down brackets into the slots in the front of the heater base pan from underside of the heater, so that they are positioned as shown in Figure 4. Install the sheet metal screws through the holes in the bracket to secure the bracket to the heater base pan.
Install the Tapcons through the inner set of holes in the tie-down brackets into the pad.
Repeat Steps 6 & 7 at the rear of the heater.
Installation is completed when (4) brackets are secured to the heater and the pad. Install the access panels when complete.

INDOOR INSTALLATION AND VENTING

Positive and Negative Pressure Venting Systems
The heater is designed such that it may be vented using either a negative-pressure or a positive-pressure venting system. The appropriate system of venting for a particular site will depend on many factors such as vent termination needs (horizontal/vertical), and the cost of venting system. Table 3 lists the indoor venting kits available and the limitations of each system. Multiple forced- or induced-draft units should never be vented using common venting or vent terminations. Never common vent this heater with other gas-burning appliances.

Here is the information presented in a properly formatted table:

Indoor Vent Kit Part Number	Description	For Use With Heater Models	Vent Pipe Limitations	Vent Pipe Material	Vent Termination Requirement
UHXNEGVT11501	Indoor Vent Adapter Kit, Negative Pressure, Vertical Venting Applications	H150FD	50 ft max vertical height, 25 ft max horizontal length (horizontal length cannot exceed 1/2 of vertical height), 3 elbows max	Single or Double Wall Galvanized Non-Sealed Vent Pipe	Vertical Only, Termination Above Roof of House/Building
UHXNEGVT12001		H200FD	50 ft max vertical height, 25 ft max horizontal length (horizontal length cannot exceed 1/2 of vertical height), 3 elbows max	Single or Double Wall Galvanized Non-Sealed Vent Pipe	Vertical Only, Termination Above Roof of House/Building
UHXNEGVT12501		H250FD	50 ft max vertical height, 25 ft max horizontal length (horizontal length cannot exceed 1/2 of vertical height), 3 elbows max	Single or Double Wall Galvanized Non-Sealed Vent Pipe	Vertical Only, Termination Above Roof of House/Building
UHXNEGVT13001		H300FD	50 ft max vertical height, 25 ft max horizontal length (horizontal length cannot exceed 1/2 of vertical height), 3 elbows max	Single or Double Wall Galvanized Non-Sealed Vent Pipe	Vertical Only, Termination Above Roof of House/Building
UHXNEGVT13501		H350FD	50 ft max vertical height, 25 ft max horizontal length (horizontal length cannot exceed 1/2 of vertical height), 3 elbows max	Single or Double Wall Galvanized Non-Sealed Vent Pipe	Vertical Only, Termination Above Roof of House/Building
UHXNEGVT14001		H400FD	50 ft max vertical height, 25 ft max horizontal length (horizontal length cannot exceed 1/2 of vertical height), 3 elbows max	Single or Double Wall Galvanized Non-Sealed Vent Pipe	Vertical Only, Termination Above Roof of House/Building
UHXNEGVT15001		H500FD	50 ft max vertical height, 25 ft max horizontal length (horizontal length cannot exceed 1/2 of vertical height), 3 elbows max	Single or Double Wall Galvanized Non-Sealed Vent Pipe	Vertical Only, Termination Above Roof of House/Building
UHXPOSHZ11501	Indoor Vent Adapter Kit, Positive Pressure, Horizontal or Vertical Venting Applications	H150FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ12001		H200FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ12501		H250FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ12502		H250FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ13001		H300FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ13501		H350FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ14001		H400FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ14002		H400FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building
UHXPOSHZ15002		H500FD	50 ft max with 1 elbow, 40 ft max with 2 elbows, or 30 ft max with 3 elbows (horizontal or vertical)	Single or Double Wall Stainless Steel Sealed Vent Pipe	Horizontal or Vertical, Termination Immediately Outside Wall of House/Building

CLEARANCES:
The heater must be installed such that the installation and service clearances from combustible materials shown in Table 4 are maintained. This heater may be installed on combustible floors. Do not install heater in a closet.

AIR SUPPLY:

Indoor installations and outdoor shelters (confined spaces) must be provided with adequate combustion and ventilation air vents to assure proper heater operation. These vents must be sized according to the requirements stated in paragraph A or B below (whichever applies to the installation). These vents must never be obstructed when heater is in operation.

When air blowers are used in spa/hot tub installations and are located in proximity to the heater, caution must be observed to ensure sufficient combustion air is available to the heater for proper combustion. A separate blower air duct is recommended.

(A) All Air Supply From Inside the Building:
The confined space shall be provided with 2 permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space (a space whose volume is not less than 50 cubic feet per 1,000 btu/hr). The total input of all gas utilization equipment installed in the combined space shall be considered in making the determination. Each opening shall have a minimum free area of 1 square inch per 1,000 btu/hr of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches. See Table 5. One opening shall be within 12 inches of the top and and one within 12 inches of the bottom of the enclosure.

(B) All Air Supply From Outdoors:
The confined space shall be provided with 2 permanent openings, one commencing within 12 inches of the bottom and one commencing within 12 inches of the top of the enclosure. The opening shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

When communicating with the outdoors (either directly or through vertical ducts), each opening shall have a minimum free area of 1 square inch per 4,000 btu/hr of total input rating of all equipment in the enclosure. See Table 5. When installing a heater below ground (in a pit), combustion and ventilation air openings must be provided as shown in Figure 5.
When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 btu/hr of total input rating of all equipment in the enclosure. See Table 5.
When ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall not be less than 3 inches.

For more detailed methods of providing air for combustion and ventilation, refer to the latest edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54).

Table 5: Combustion and Ventilation Air Requirements
Free Area per Btu Requirement	Total Input (Btu/hr)	Combustion Air Free Area Required (sq. in.)	Ventilation Air Free Area Required (sq. in.)
1 sq. in. per 1,000 Btu/hr (paragraph A)	150,000	150	150
	200,000	200	200
	250,000	250	250
	300,000	300	300
	350,000	350	350
	400,000	400	400
	500,000	500	500
1 sq. in. per 2,000 Btu/hr (paragraph B-2)	150,000	75	75
	200,000	100	100
	250,000	125	125
	300,000	150	150
	350,000	175	175
	400,000	200	200
	500,000	250	250
1 sq. in. per 4,000 Btu/hr (paragraph B-1)	150,000	37.5	37.5
	200,000	50	50
	250,000	62.5	62.5
	300,000	75	75
	350,000	87.5	87.5
	400,000	100	100
	500,000	125	125

REMOTE CONTROL CONNECTION

The heater is equipped for con-nection to an external 2-wire remote thermostat or a 3-wire remote switch. A 2-wire thermostat has its own tempera-ture sensor for regulating water tempera-ture. A 3- wire remote switch allows the “POOL” or “SPA” models to be re-motely selected. Connect remote wiring to the terminal block located in the lower compartment inside the junction box (see Figure 18). The heater has 2 junction boxes (one on each side of the heater). Only one junction box should be used for remote wiring. Do not remove the wires connected to the remote connection ter-minal block. Remote wiring must be run in a separate conduit. Use 22 AWG wire for runs less than 30 feet. Use 20 AWG wire for runs over 30 feet. The maximum allowable run is 200 feet.

2-WIRE REMOTE CONTROL CONNECTION:

To configure the heater for 2- wire remote thermostat control, use the “MODE” key on the heater keypad to put the control into “STANDBy” mode. Then press and hold both the “( - )” and “MODE” keys for 3 sec-onds until the display shows the code “bo”.
On the remote control wiring terminal block (Figure 18), connect the appropriate wires from the remote control to the terminals adjacent to the ORANGE wire (“POOL”) and WHITE wire (“24V”).
To operate the heater by remote thermostat, the heater’s control must be in either “POOL” or “SPA” mode. The display will show “bo”. The “POOL” or “SPA” LED will be illuminated. The remote thermostat will operate the heater. The heater’s thermostat will function to limit the water temperature to a maximum of 104°F.

3-WIRE REMOTE CONTROL CONNECTION:

On the remote control wiring terminal block, connect the appropriate wires from the remote control to the terminals adjacent to the ORANGE wire (“POOL”), WHITE wire (“24V”), and RED wire (“SPA”).

To operate the heater with a remote 3-wire switch, the heater’s control must be in “STANDBy” mode.
The “STANDBy” LED will be illuminated. When the remote switch is set to “Pool/Low” the “POOL” LED will be illuminated and the water temperature will be displayed.
When the remote switch is set to “Spa/High” the “SPA” LED will be illuminated and the water temperature will be displayed. The heater will use its internal thermostat to regulate the water temperature to the set point of the mode selected.

Setup Guide

To operate the Hayward H500FD Hot Tub Heater, follow these steps:

Ensure all electrical connections are secure and compliant with local codes.
Connect the heater to your hot tub's plumbing system according to the manufacturer's instructions.
Set the desired temperature using the control panel.
Turn on the power and allow the heater to ignite electronically.
Monitor the temperature and adjust as necessary.

FOR YOUR SAFETY

WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, injury, or death.

Do not store or use gasoline or other flam- mable vapors or liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS:

Do not try to light any appliance.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
If you cannot reach your gas supplier, call the fire department.
- Installation and service must be performed by a qualified installer, service agency, or the gas supplier.

FOR YOUR SAFETY
This product must be installed and serviced by authorized personnel, qualified in pool/spa heater installation. Improper installation and/or operation can create carbon monoxide gas and flue gases that can cause serious injury, property damage, or death.

SAFETY INFORMATION

Basic safety precautions should always be followed, including the following: Failure to follow instructions can cause severe injury and/or death.

This is the safety-alert symbol. When you see this symbol on your equipment or in this manual, look for one of the following signal words and be alert to the potential for personal injury.

WARNING warns about hazards that could cause serious personal injury, death or major property damage and if ignored presents a potential hazard.
CAUTION warns about hazards that will or can cause minor or moderate personal injury and/or property damage and if ignored presents a potential hazard. It can also make consumers aware of actions that are unpredictable and unsafe.
ATTENTION indicates special instructions that are important but not related to hazards.

READ AND FOLLOW ALL INSTRUCTIONS IN THIS OWNER’S MANUAL AND ON EQUIPMENT.

IMPORTANT SAFETY INSTRUCTIONS
Before installing or servicing this electrical equipment, turn power supply OFF.

KEEP SAFETY LABELS IN GOOD CONDITION AND REPLACE IF MISSING OR DAMAGED.

WARNING – To reduce risk of injury, do not permit children to use or climb on the heater, pumps or filters. Closely supervise children at all times. Components such as the filtration system, pumps, and heaters must be positioned to prevent children from using them as a means of access to the pool.
CAUTION – This heater is intended for use on permanently installed swimming pools and may also be used with spas. Do NOT use with storable pools. A permanently installed pool is constructed in or on the ground or in a building such that it cannot be readily disassembled for storage. A storable pool is constructed so that it is capable of being readily disassembled for storage and reassembled to its origi-nal integrity.

Though this product is designed for outdoor use, it is strongly recommended to protect the electrical components from the weather. Select a well drained area, one that will not flood when it rains. It requires free circulation of air for cooling. Do not install in a damp or non-ventilated location.

WARNING – It is required that licensed electricians do all electrical wiring. Risk of Electric Shock. Hazardous voltage can shock, burn, cause death or serious property damage. To reduce the risk of electric shock, do NOT use an extension cord to connect unit to electric supply. Provide a properly located outlet. All electrical wiring MUST be in conformance with applicable local and national codes and regulations. Before work-ing on this unit, turn off power supply to the heater.

WARNING – To reduce the risk of electric shock replace damaged wiring immediately. Locate conduit to prevent abuse from lawn mowers, hedge trimmers and other equipment.

WARNING – Failure to bond to pool structure will increase risk for electrocution and could result in injury or death. To reduce the risk of electric shock, the electrician must comply with installation instructions and must bond the heater accordingly. In addition, the licensed electrician must also con-form to local electrical codes for bonding requirements.

GENERAL INFORMATION

This manual contains instructions for installation, operation, maintenance, troubleshooting, and parts lists for the safe use of the swimming pool/spa/hot tub heaters. Hayward strongly recommends that the installer read the manual before installing the swimming pool/spa/hot tub heater. If after reviewing the manual any questions remain unanswered, contact the factory or local representative. Following heater installation, the installer should leave all manuals with the consumer for future reference.

Warranty

Hayward warrants the pool/spa/hot tub heater to be free from defects in materials and workmanship, and will within one year from date of installation for all users, for the original purchaser, repair or, at our option, replace without charge any defective part. Hayward further warrant that if the heat exchanger or exchanger headers (water-containing section) leak within one year from date of such installation for all users, due to defects in materials and workmanship, Hayward will provide a replacement part. Cost of freight, installation, fuel, and service labor (after one year) is at user’s expense. For full details of warranty agreement, see warranty certificate included in this manual.

WARNING: Failure to maintain proper water chemistry may cause premature heat exchanger damage or failure.

The heat exchanger in your Hayward pool heater is made from the highest quality of copper and nickel (Cupronickel) materials. The premium materials and the exacting processes used in the manufacture of the heat exchanger is state of the art in pool heater design and manufacture. Yet, it remains vital that the heat ex-changer be protected from damaging or corrosive chemicals, insufficient water flow or improperly balanced water chemistry. Heat exchanger damage or failure resulting from improper flow, improperly balanced pool water or the improper addition of sanitizer into the water is NOT covered under the terms of your warranty.

The following factors are critical to heat exchanger protection. Follow these guidelines to help prevent pre-mature damage or failure to your heater and heat exchanger.

WATER FLOW THROUGH HEATER
Water must be flowing through the heater at the minimum rated flow rate during operation. Check that
the pump is operating and the system is filled with water and purged of all air prior to starting the heater. The minimum rated flow rates are listed on page 25. Some installations may require an adjustment to the water pressure switch for proper low-flow protection. Test your system and if necessary, adjust the water pressure switch as described on page 35.

POOL/SPA WATER CHEMISTRY
The chemistry balance and mineral content of swimming pool water changes daily due to the addition of
pool and sanitizing chemicals, bather loads, rain, runoff and the amount of sun - to name a few. Improper chem-istry balance and mineral content can cause scaling and deposits to form on pool walls, in the filtration system, in the heat exchanger tubes and additionally can promote corrosive action to all metals in the water path. Chang-ing spa water regularly and maintaining the correct chemical balance in your pool/spa will keep the pool/spa safe and sanitary, and will help protect the heat exchanger. Use a 4-way pool/spa water test kit to check your water frequently (at least weekly). Use the following guidelines to help protect your heater’s heat exchanger

	Recommended Level	Effect of Low Levels	Effect of High Levels
Chlorine	1 - 3 ppm	hazy water, algea growth, bacteria causing infections	swimmer irritation, bleaching of clothes/hair, corrosive to heat exchanger
Bromine	2 - 4 ppm	hazy water, algea growth, bacteria causing infections
pH	7.4 - 7.6	corrosive to heat exchanger, swimmer irritation	cloudy water, scaling of heat exchanger, reduced sanitizer effectiveness
Total Alkalinity	80 - 120 ppm	corrosive to heat exchanger, large fluctuations in pH	scaling of heat exchanger
Calcium Hardness	200 - 400 ppm	corrosive to heat exchanger	scaling of heat exchanger
Salt	2700 - 5000 ppm	poor salt chlorinator performance	corrosive to heat exchanger

SKIMMER CHLORINATION
Placing chlorine or bromine tablets directly into the skimmer may result in high chemical concentrations flowing through the heater. DO NOT place chlorine or bromine tablets in the skimmer.
CHLORINATOR INSTALLATION
Chlorinators must be installed downstream of the heater, and a check valve must be installed between the heater and chlorinator to prevent high chemical concentrations from back flowing into the heater. Make sure your piping arrangement meets the chlorinator installation requirements shown on page 26.
BYPASS
Until water chemistry is properly balanced, and if your piping has a bypass valve installed for the heater, open the bypass so that corrosive and potentially damaging water will not flow through the heater and there-fore the heat exchanger. Close the bypass valve once the water is properly balanced. Failure to close the bypass valve when attempting to operate the heater will result in extensive damage to the heat exchanger. Ensure water flow through the heater is restored before operating the heater. A bypass feature is also advanta-geous for service needs and for the ability to remove the heater from the water path when not heating.

Error Messages

Code	Description	Information
bD	Internal fault/power-up error	On initial trial for ignition. Automatic reset is immediate once the gas valve relay check results are acceptable.
bD	Gas valve sensed as “ON” error	If valve is open when it should be closed the heater will shut down and go into lockout. Blower will operate until error condition is corrected. Automatic restart 2 minutes after error is corrected.
bD	Gas valve sensed as “OFF” error	If valve is closed but flame is sensed the blower will run for 5 s then start a new ignition sequence. If error occurs 10 times during a call for heat the control will go into lockout. Automatic reset is 60 minutes.
bD	Data retrieval error	If control input data is corrupted the heater will shut down and go into lockout.
HF	Flame present with gas valve “OFF” error	If flame is sensed with the gas valve off the control will go into lockout. The blower will run until error condition is corrected. When corrected, control will run blower for 5 s then automatically restart after 2 minutes.
PF	Electrical supply wiring error	This code will display if 120V polarity is reversed, low voltage is detected, or if the ground path is not sufficient. Reset is immediate after error is corrected.
AO	Blower vacuum switch open error	If the blower prover switch does not close after the blower starts the control will stop the ignition trial go into lockout. The blower will continue to run. Automatic reset is immediate after the switch closes.
AO	Blower vacuum switch open when expected closed error	If the blower prover switch opens unexpectedly during operation the control will shut down and attempt to re-light. If the switch does not close after the blower starts the control will go into lockout with the blower running. Automatic reset is immediate after error is corrected.
AO	Blower vacuum switch open during post-purge error	If the blower prover switch opens during the post purge cycle (heater is not fir- ing) the control will display the error code. The post-purge cycle will be com- pleted once the blower prover switch closes.
AC	Blower vacuum switch closed when expected open error	If the blower prover switch is closed before blower start-up the control will not start the blower. Automatic reset is immediate when the switch opens.
IO	Igniter open error	If the control is not in lockout and senses that the igniter circuit is open when the blower is running the control will turn off the blower and go into lockout. Auto- matic restart 2 min after error is corrected.
SF	Thermistor error	An excessive temperature difference between the two thermistors (5 °F or more) or an “out of bounds” condition on both sensors (less than 10°F or greater than 180°F) will result in the error code. Automatic restart is 2 minutes after the error is corrected.

HS	Water Temperature Sensing Error	A) Inlet water temperature sensor is reporting a temperature in excess of 104°F. Normal operation resumes 2 minutes after inlet water temperature sensor reports temperatures of 104°F or less. This error functions in both normal and remote thermostat modes. or B) Inlet water temperature sensor is reporting a temperature change at a rate faster than 6°F in 60 seconds or less while the heater is firing, indicating a po- tentially damaging low water flow condition. Normal operation resumes when temperatures stabilize. If this condition is detected 3 times in a one hour period, the heater will lock-out until the electrical power is cycled off and back on.
Sb	Keypad button stuck closed error	If one of the keypad buttons is closed (or pressed) for more than 30 s the error code will be displayed but the control will continue to function. The error code will be cleared when the condition is corrected.
IF	Ignition failure error	If the control exceeds the maximum number of ignition retries or recycles the heater will shut down and go into lockout. Automatic reset is 60 minutes.
CE	Communication error	If communication between the ignition board and the display board is not estab- lished within 3 s of power-up an error will be displayed. After communication is established, if it is lost for 30 s, the error will be displayed. The error code will be cleared upon a valid data exchange between boards.
LO	Limit string open error	If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes. See the troubleshooting section for more detail.
EE	EEPROM ERROR	An error was detected in the ignition control circuit board.

Troubleshooting

Code	Fault	Diagnosis Step	Remedy
None	Heater will not power up.	1. Check for Low & High Voltage Output from Fuse Board	Disconnect plug from P5 connector from Fuse Board. Measure for 24VAC between pins of receptacle on Fuse Board. Reconnect plug. Disconnect plug from P6 of Fuse Board. Measure for 120VAC between pin 3 and 5 of receptacle on Fuse Board. Reconnect plug. If OK, proceed to section titled ‘‘Low voltage circuit fault’’. Otherwise, proceed to step 2.
		2. Ensure field power supply to heater is turned on.	Measure for field supply voltage across terminals of TB1 terminal block on Fuse Board. If OK, proceed to step 3
		3. Check for faulty Fuse Board wiring.	Insoect Fuse Board wiring. Ensure all plugs are securely fastened to Fuse Board. If OK, proceed to step 4.
		4. Verify that FC1 and FC2 Fuses on Fuse Board are not open.	Remove FC1 and FC2 fuses from fuseholder. Measure continuity across fuse. If fuses are open, proceed to section titled ‘‘Open FC1 and/or FC2 Fuses’’. If fuses are OK, reinstall them and proceed to step 5.
		5. Verify that 240vac Voltage Selector Plug is not installed with a 120vac field power supply	Check that proper Volatage Selector Plug is installed in Fuse Board. If OK, proceed to step 6
		6. Check for defective Transformer.	Disconnect plug from P4 connector from Fuse Board. Mesure for 24VAC between pins 1 & 2 of plug of Transformer and 120VAC between pins 4 & 6. If 24VAC or 120VAC is not present, replace Transformer. Otherwise, proceed to step 7.
		7. Fuse Board is defective	Replace Fuse Board.
	Low voltage circuit fault.	1. Check for Low Voltage Output from Fuse Board	Diconnect plug from P5 connector from Fuse Board. Measure for 24VAC across pins. Reconnect plug. If OK, proceed to step 2. Otherwise, proceed to step 5.
		2. Check for faulty Control Module wiring.	Inspect Control Module wiring. Ensure all plugs are securly fastened to Control Module. If OK, proceed to step 3.
		3. Verify low voltage input to Control Module.	Verify 24VAC across R and C terminals on Control Module. If not OK, replace harness. If OK, procced to step 4.
		4. Verify that F1 Fuse on Control Board is not open.	Remove F1 fuse from fuseholder. Measure continuity across fuse. If OK, replace Control Module. If fuse is open, proceed to section titled ‘‘Open FC3 or FC1 Fuses’’.
		5. Verify that FC3 on Fuse Board is not open	Remove FC3 fuse from fuseholder. Measure continuity across fuse. If fuse is open, proceed to section titled ‘‘Open FC3 or FC1 Fuses’’. If OK, reinstall fuse and proceed to step 6.
		6. Check for defective Transformer.	Disconnect plug from P4 connector from Fuse Board. Mesure for 24VAC between pins 1 & 2 of plug from transformer. If 24VAC is not present, replace Transformer. Otherwise, proceed to step 7.
		7. Fuse Board is defective	Replace Fuse Board

None

Open FC1 and/ or FC2 Fuses.

1. Verify that 120VAC Voltage Selector Plug is not installed with a 240VAC field power supply.

Check that proper Voltage Selector Plug is installed. If OK, proceed

to step 2.

If 120VAC plug is installed and field supply voltage is 240VAC, FC1 and FC2 fuses will have to be opened. Install the correct Voltage Selector Plug and new FC1 and FC2 fuses.

2. Check for faulty

Transformer wiring.

Inspect Transformer wiring. Ensure insulation on wiring is not worn.

If OK, proceed to step 3.

3. Defective Transformer

Replace Transformer.

Open FC3 and/

or F1 Fuses

1. Check for faulty Gas Valve wiring.

Inspect Gas Valve wiring. Ensure insulation on wiring is not worn. If OK, proceed to step 2.

2. Verify that Gas Valve is

not defective.

Measure for resistance across Gas Valve terminals and between each terminal and ground. If short exists, replace Gas Valve. If OK, proceed to step 3.

3. Check for faulty Control

Module wiring.

Inspect Control Module wiring. Ensure insulation on wiring is not worn. If OK proceed to step 4.

4. Control Module is

defective.

Replace Control Module.

Open FC4 Fuse.

1. Check for faulty Igniter

wiring.

Inspect Igniter wiring. Ensure insulation on wiring is not worn. If

OK, proceed to step 2.

2. Check for faulty Blower

wiring.

Inspect Blower wiring. Ensure insulation on wiring is not worn. If

OK, proceed to step 3.

3. Check for defective

Igniter.

Disconnect Igniter plug from Control Module. Measure resistance across Igniter. Resistance should be 10.9-19.7 ohms at at 77°F. If out of this range, replace igniter. If OK, proceed to step 4

4. Check for defective

Blower.

Disconnect Blower plug from Control Module. Measure resistance across Blower windings. Winding resistance across lead should be in the following range: Red-to-White: 4 to 5 ohms. If measured values vary substantially from these values, blower is defective. Replace.

Otherwise proceed to step 5.

5. Control Module is

defective.

Replace Control Module.

Bad Board or Secondary High Voltage Fault

1. Verify that FC4 Fuse on

Fuse Board is not open.

Remove FC from fuseholder. Mesure continuity across fuse. If OK, reinstall fuse and proceed to step 2. If Fuse is open, proceed to section titled ‘‘Open FC4 Fuse’’.

2. Verify high voltage output

from Fuse Board.

Disconnect plug from P6 connector of Fuse Board. Measure for 120VAC across pins 3 and 5 of P6 receptacle on Fuse Board. If OK, reconnect plug and proceed to step 3. If not OK, go to step 4.

3. Check for defective

Harness.

Disconnect plug from E10 connector of Contol Module. Measure for 120VAC across pins 1 and 3 of Plug on Harness. If OK, replace Control Module. If not OK, replace Harness.

4. Check for defective

Transformer.

Disconnect plug from P4 connector of Fuse Board. Measure for 120VAC between pins 4 and 6 of plug from Transformer. If OK, proceed to step 5. If not OK, replace Transformer.

bD	Bad Board or Secondary High Voltage Fault	5. Fuse Board is defective	Replace Fuse Board.
EE	Bad Board	1. Defective Control Module	Replace Control Module.
CE	Communicat- ion Error between Control Module and Display Interface Assembly	1. Disconnect and then re- connect power to heater.
		2. Check for faulty wiring or connection.	Inspect Display Interface Wiring. Ensure Display Interface Plug is securely attached to Control Module. If OK, proceed to step 2.
		3. Control Module and/or Display Interface Assembly are defective.	Replace Control Module and/or Display Interface Assembly.
IO	Igniter Failure	1. Check for faulty wiring or connection.	Inspect Igniter wiring. Ensure Igniter Plug is securely attached to Control Module. If OK, proceed to step 2.
IO	Igniter Failure	2. Igniter is defective	Replace Ignitier.
Sb	Keypad Failure	1. Keypad is defective	Replace Display Interface Assembly.
SF	Temperature sensor input failure	1. Check for faulty wiring or connection.	Inspect sensor wiring. Ensure sensor is pluggd into back of control module. If OK, proceed to step 2.
SF	Temperature sensor input failure	2. Sensor is defective	Replace temperature sensor.
HS	Water Temperature Sensing Error	1. Check remote thermostat setting	Verify set point setting of remote thermostat is at or below 104°F. If set point of remote thermostat is OK, or if heater is not configured for remote thermostat, proceed to step 2.
		2. Verify that the water flow is adequate	Verify that water flow to heater is above minimum required (20 GPM for H150FD and H200FD, 25 GPM for H250FD and H300FD, 30 GPM for H350FD and H400FD). Note that intermittent periods of low water flow will cause this error. If OK, proceed to step 3.
		3. Check inlet water temperature sensor	Compare the heater's temperature reading to the pool water temperature with an accurate thermometer. If significantly different, replace inlet water temperature sensor.
HF	Flame Present with Gas Valve not Energized	1. ICB is defective	Using the sight glass, check to see if the flame is present in the unit. If not, replace ICB. If flame is present, move to next step. Without disconnecting the valve from the wiring harness, use a voltmeter to determine if 24 VAC is present at the gas valve connections. If so, replace ICB. If not, move to step 3.
HF	Flame Present with Gas Valve not Energized	2. Gas Valve is defective	Replace Gas Valve
LO	Water pressure switch fault	1. Verify that the pump is running.	This is a normal display when the pump is off. Turn pump on. LO code should clear. If LO does not clear, proceed to step 2.
		2. Verify that water flow is adequate	Verify that water flow rate to heater is above minimum required (20 GPM for H150FD and H200FD, 25 GPM for H250FD and H300FD, 30 GPM for H350FD and H400FD). If OK, proceed to step 3
		3. Check for faulty wiring or connection.	Inspect water pressure switch wiring. Ensure wire harness terminals are securely fastened to spade terminals on water pressure switch. If OK, procced to step 4.

LO	Water pressure switch fault	4.Verify state of water pressure switch contacts.	Remove wire leads from water pressure switch and measure continuity across water pressure pressure switch with the pump running. If open, proceed to step 5. If closed, LO code is not caused by water pressure switch fault. Reconnect wire leads to water pressure switch.
		5. Ensure that low pump pressure does not exist.	Clean filter or clear blockages. Check position of valves in plumbing system. If OK proceed to step 6.
		6. Check for correct water pressure switch setting.	Adjust water pressure switch setting as shown on page 35 of Installation Manual (only if heater is above or below water level). If LO does not clear, proceed to step 7.
		7. Water pressure switch is defective	Replace water pressure switch.
	Vent pressure switch fault	1. Check for faulty wiring or connection.	Inspect vent pressure switch wiring. Ensure wire harness terminals are securely fastened to spade terminals on vent pressure switch. If OK, proceed to step 2.
		2. Verify state of vent pressure contacts.	Remove wire leads from vent pressure switch and jumper leads. Operate heater. Measure continuity across vent pressure switch. If closed, LO code is not caused by vent pressure switch fault. If open, proceed to step 3. Remove jumper from wire leads and reconnect wire leads to vent pressure switch.
		3. Check for restricted or blocked flue.	Ensure that flue is not blocked or restricted. See indoor vent sizing requirements in installation manual. If OK, proceed to step 4.
		4. Vent pressure switch is defective.	Replace vent pressure switch.
	Temperature limit switch fault	1. Check for faulty wiring or connection.	Inspect temperature limit switch wiring. Ensure wire harness teminals are securely fastened to spade terminals on temperature limit switches. If OK, proceed to step 2.
		2. Verify state of temperature limits’ contacts	Remove wire leads from limit switch and jumper leads. Operate heater. Measure continity across limit switches. If closed, LO code is not caused by temperature limit switch fault. If open, proceed to step 3. Remove jumper from leads and reconnect leads to temperature limits.
		3. Verify that water flow is adequate	Verify that water flow rate to heater is above the minimum required (20 GPM for H150FD and H200FD, 25 GPM for H250FD and H300FD, 30 GPM for H350FD and H400FD). If OK, proceed to step 4.
		4. Temperature limit switch is defective.	Replace temperature limit switch.
	Exhaust gas temperature limit fault	1. Check for faulty wiring or connection	Inspect temperature limit switch wiring. Ensure wire harness terminals are securely fastened to spade terminals on temperature limit switch located in the flue collector panel above the center of the header. If OK, proceed to step 2.
	Exhaust gas temperature limit fault	2. Verify state of temperature limit’s contacts	Remove wire leads from limit switch and measure continuity across limit switch contacts. If closed, LO code is not caused by exhaust gas temperature limit switch fault. If open, proceed to step 3.

LO	Exhaust gas temperature limit fault	3. Heat exchanger has been damaged	Heat exchanger has been damaged. This is generally due to low water flow, poor water chemistry, or a combination of these and other factors. Rectify all issues with water flow through the heater and water chemistry and then replace the heat exchanger and exhaust gas temperature limit. Continuing to run the heater after this limit has tripped will cause damage to the entire unit and will not be covered by the warranty.
IF	Ignition Failure	1. Ensure gas supply shutoff valves are open.	Ensure that main gas shutoff installed adjacent to heater is open. Ensure that knob on gas valve inside unit is in ‘‘on’’ position. If OK, proceed to step 2.
		2. Check for low gas supply pressure	Ensure inlet gas supply pressure is between the minimum and maximum values indicated on rating plate. If OK, proceed to step 3.
		3. Check for faulty flame sense wiring or connection.	Inspect flame sense wiring. Ensure wire harness terminals are securely fastened to flame sense and to control module. If OK, proceed to step 4.
		4. Check for faulty gas valve wiring or connection	Inspect gas valve wiring. Ensure wire harness terminals are securely fastened to spade terminals on gas valve. If OK, proceed to step 5.
		5. Check for gas valve failure or gas valve relay failure.	1. Measure voltage across gas valve during trial for igintion. If 24VAC is present and gas valve does not open, gas valve is defective. Replace gas valve.
		5. Check for gas valve failure or gas valve relay failure.	2. If 24VAC is not present, gas valve relay on control module is defective. Replace control module.
		6. Check for blockages in gas orifices and burners	Inspect gas orifices for blockages which could prevent gas flow. Remove and inspect burners for blockages.
AC	Blower vacuum switch closed.	1. Check for defective blower on relay or control module.	Disconnect Blower plug fron Control Module. With heater off, measure continuity across pins 1 and 2 of receptacle on Control Module. If closed, control module relay is defective. Replace control module. If OK, proceed to step 2.
AC	Blower vacuum switch closed.	2. Vacuum switch is defective.	Replace blower vacuum switch.

Blower vacuum switch open.

1. Check for faulty vacuum

switch tubing

Check tubing and replace if necessary. If OK, proceed to step 2.

2. Check for faulty vacuum

switch wiring or connection.

Inspect vacuum switch wiring. Ensure wire harness terminals are securely fastened to spade terminals on vacuum switch. If OK, proceed to step 3.

3. Check for faulty blower

wiring or connection

Inspect blower wiring. Ensure plug on blower is securely fastened to

control module. If OK, proceed to step 4.

4. Check for defective

vacuum switch

Disconnect Blower plug from Control Module. Measure resistance across Blower windings. Winding resistance across lead should be in the following range; Red-to-White: 4 to 5 ohms. If measured values vary substantially from these values, Blower is defective. Replace.

If OK, proceed to step 5.

5. Check for defective

blower relay.

Disconnect Blower plug from Control Module. Place heater in Pool or Spa Mode. Lower set point temperature to generate call for heat. During pre-purge period, measure for 120VAC across pins 1 and 2. If 120VAC is not present, control module relay is defective. Replace control module. If OK, proceed to step 6

6. Vacuum switch is

defective

Replace blower vacuum switch.

Bypass Operation

1. Check to see if Control Module is in Bypass Operation

This is normal display when heater is being controlled by a remote thermostat. No service is required. If heater is not being controlled by remote thermostat, change setting by using the MODE key to put the heater into STANDBY. Press and hold the DOWN key and then press and hold the MODE key. Hold down both keys for 3 seconds until the indication ‘‘bO’’ is removed from the display.

Warranty

Warranty extends in duration to the term of (2) years for all non-ASME certified products ONLy when products are installed and serviced by a licensed and qualified pool equipment professional with sufficient experience in pool equipment installation and maintenance and adhering to the requirements of the jurisdic-tion where the product is installed. There are no warranties which extend beyond the description on the face hereof. We shall not in any event be held liable for any special, indirect or consequential damages.

Pros & Cons

Pros

High-efficiency heating reduces energy costs.
Corrosion-resistant design for long-lasting performance.
Electronic ignition enhances safety and reliability.
Compact design suitable for various installations.
Environmentally friendly operation.

Cons

Higher initial cost compared to some other heaters on the market.
May require professional installation if not familiar with setup process.
Slightly louder operation compared to some other models.

Customer Reviews

Customers have generally praised the Hayward H500FD Hot Tub Heater for its efficient heating and durable construction. Many have noted that it quickly heats their hot tubs to the desired temperature while being relatively quiet during operation. However, some users have mentioned that the initial cost is higher than expected, although they agree it is worth the investment due to its long-term benefits.

A common complaint is that the installation process can be complex and may require professional assistance. Despite this, overall satisfaction with the product remains high among users.

Heater Panel	Required Clearance
Top	Unobstructed
Front	18 inches
Back	6 inches
Water Connection Side	12 inches
Side Opposite Water Connec- tion	6 inches

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