Hayward 150 User Manual

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USE ONLY GENUINE REPLACEMENT PARTS 1

51300004201B

IN GROUND POOL/SPA GAS HEATERS

INSTALLATION & OPERATIONS MANUAL

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

flammable 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.

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.

SAVE THESE

INSTRUCTIONS

CONTENTS Pg

GETTING STARTED 2

INSTALLATION 10

LOCATING THE HEATER 11

ALTITUDE OF INSTALLATION 13

AIR SUPPLY 14

FLUE GAS VENTING 15

GAS SUPPLY 19

WATER PIPING 21

ELECTRICAL CONNECTIONS 24

CHECK-OUT & START-UP 25

CONTROL SETUP 26

GAS TESTING 28

WATER TESTING 31

MAINTENANCE & SERVICE 31

WATER CHEMISTRY 31

WINTERIZATION 32

COMPONENT SERVICE 32

TROUBLESHOOTING 39

PARTS 49

Questions and Answers:

U
ufryeJul 31, 2025
What to do if my Hayward 150 Gas Heater displays 'LO' with a Temp. Limit Switch Fault?
- B
  Brenda BrooksJul 31, 2025
  The 'LO' code on your Hayward Gas Heater, accompanied by a Temp. Limit Switch Fault, can often be resolved by checking the temperature limit switch wiring. Ensure the wire harness terminals are securely fastened to the spade terminals on the temperature limit switches. If the wiring is secure, but the issue persists, remove the wire leads from the limit switch and use jumper leads to operate the heater. Measure continuity across the limit switches. If closed, the 'LO' code is not caused by a temperature limit switch fault. If open, replace the temperature limit switch. Also, verify that the water flow rate to the heater is above the minimum required.
A
Amanda CoffeyAug 4, 2025
What to do if my Hayward Gas Heater displays 'LO' with a Water Pressure Switch Fault?
- B
  bryanmillerAug 4, 2025
  The 'LO' code on your Hayward Gas Heater, when accompanied by a Water Pressure Switch Fault, is a normal display when the pump is off. Turn the pump on to see if the 'LO' code clears. If the code persists, verify that the water flow rate to the heater is above the minimum required. Also, inspect the water pressure switch wiring, ensuring the wire harness terminals are securely fastened to the spade terminals on the water pressure switch. If the heater is above or below water level, adjust the water pressure switch setting as presented in the manual. If the 'LO' code still does not clear, replace the water pressure switch.
A
April MitchellAug 9, 2025
What to do if my Hayward 150 Gas Heater displays 'LO' with a Vent Pressure Switch Fault?
- K
  karla97Aug 9, 2025
  If your Hayward Gas Heater displays 'LO' with a Vent Pressure Switch Fault, start by inspecting the vent pressure switch wiring. Make sure the wire harness terminals are securely fastened to the spade terminals on the vent pressure switch. If the wiring is secure, remove the wire leads from the vent pressure switch and use jumper leads. Operate the heater and measure continuity across the vent pressure switch. If it's closed, the 'LO' code isn't due to a vent pressure switch fault. If it's open, ensure that the flue isn't blocked or restricted. Also, verify the heat exchanger and burners are not blocked. If the issue remains, replace the vent pressure switch.
F
fmccarthyAug 17, 2025
What does 'AC' displayed on Hayward 150 mean?
- E
  Elizabeth WaltonAug 17, 2025
  If your Hayward Gas Heater displays the 'AC' code indicating an Air switch circuit closed error, disconnect the blower plug from the ignition control board. With the heater off, measure continuity across pins 1 and 2 of the receptacle on the ignition control board. If the circuit is closed, the ignition control board relay is defective, and you should replace the ignition control board. If the relay is OK, replace the blower vacuum switch.

Hayward 150 Specifications

General

BTU Input	150, 000 BTU
Fuel Type	Natural Gas or Propane
Weight	120 lbs
Heat Exchanger	Cupro-Nickel
Model	H150FDN (Natural Gas) / H150FDP (Propane)

Summary

INITIAL SAFETY GUIDANCE

PLEASE READ BEFORE PROCEEDING

Basic safety precautions should always be followed, including signal words and alerts.

SAFETY INFORMATION

Suction Entrapment Hazard

Warning on suction outlet hazards and entrapment.

HAZARDOUS CONDITIONS

Hazardous Pressure Warning

Warning on system pressure during operation and servicing.

Electrical Shock Hazard

Warning on electrical hazards and necessary precautions.

HEALTH RISKS

Hyperthermia Risk Warning

Warning about dangers of prolonged immersion in hot water.

INSTALLATION PROCEDURE

EQUIPMENT INSPECTION

Inspect heater carton for damage upon receipt.

UNCARTING THE HEATER

Step-by-step instructions to remove shipping carton.

HEATER LOCATION AND CLEARANCES

LOCATING THE HEATER GUIDELINES

Guidelines for selecting a suitable heater location.

CLEARANCES FOR INSTALLATION

Maintain required clearances from combustibles and for service.

ALTITUDE OF INSTALLATION

High-Altitude Conversion Procedure

Procedure for selecting appropriate conversion kits based on altitude.

GAS SUPPLY REQUIREMENTS

GAS SUPPLY AND PIPING SIZING

WATER PIPING INSTALLATION

ELECTRICAL CONNECTIONS

GENERAL ELECTRICAL SPECIFICATIONS

Electrical requirements, voltage conversion, and wiring standards.

CHECK-OUT AND START-UP

REMOTE CONTROL CONNECTION

Connecting 2-wire or 3-wire remote controls for thermostat or mode selection.

CONTROL SETUP AND OPERATION

OPERATING MODES EXPLAINED

Description of STANDBY, SPA, POOL, and BYPASS operating modes.

USER PANEL AND KEYPAD OPERATION

Explanation of user interface for controlling the heater.

HEATER OPERATION MODES

POOL AND SPA MODES OPERATION

How the heater functions in POOL and SPA modes to maintain temperature.

TEMPERATURE SETTING ADJUSTMENT

How to adjust and lock maximum temperature settings for POOL and SPA.

GAS TESTING PROCEDURES

GAS LINE LEAK TESTING

Leak testing the appliance and gas connection before operation.

GAS PRESSURE TESTING

Verifying gas pressure requirements for proper burner operation.

LIGHTING AND OPERATING INSTRUCTIONS

HEATER LIGHTING STEPS

Step-by-step guide for lighting and operating the heater.

GAS PRESSURE TEST PROCEDURE

Measuring and Adjusting Gas Pressures

WATER TESTING AND ADJUSTMENT

WATER PRESSURE SWITCH TEST AND ADJUSTMENT

MAINTENANCE AND SERVICE

PERIODIC INSPECTION GUIDELINES

WATER CHEMISTRY MANAGEMENT

WATER CHEMISTRY GUIDELINES

Maintaining proper water chemistry to prevent heat exchanger damage.

COMPONENT SERVICE

HEATER SERVICE PROCEDURES

HEAT EXCHANGER INSPECTION AND CLEANING

Procedure for inspecting and cleaning the heat exchanger.

BURNER INSPECTION AND CLEANING

Procedure for inspecting and cleaning the main burners.

BURNER REMOVAL AND REPLACEMENT

COMPONENT REPLACEMENT (GAS & IGNITION)

GAS VALVE REPLACEMENT

IGNITER REPLACEMENT

FLAME SENSOR REPLACEMENT

BURNER ORIFICE REPLACEMENT

COMPONENT REPLACEMENT (AIR & VENT)

BLOWER VACUUM SWITCH SERVICE

HIGH LIMIT SWITCHES SERVICE

VENT PRESSURE SWITCH SERVICE

EXHAUST GAS TEMPERATURE LIMIT SERVICE

COMPONENT REPLACEMENT (SENSORS & VALVES)

THERMISTOR REPLACEMENT

WATER PRESSURE SWITCH REPLACEMENT

TRANSFORMER REPLACEMENT

COMPONENT REPLACEMENT (BLOWER)

COMBUSTION BLOWER REPLACEMENT

TROUBLESHOOTING GUIDE

FUSE SPECIFICATIONS

TROUBLESHOOTING LOOKUP CHART

Heater Will Not Power Up Diagnosis

Steps to diagnose and resolve issues when the heater does not power up.

Low Voltage Circuit Fault Diagnosis

Steps to diagnose and resolve low voltage circuit faults.

TROUBLESHOOTING LOOKUP CHART (cont.)

Open FC1/FC2 Fuses Diagnosis

Air Switch Circuit Open Error Diagnosis

Communication Error Diagnosis

Water Pressure Switch Fault Diagnosis

Exhaust Gas Temp. Limit Fault Diagnosis

Open FC3/F1 Fuses Diagnosis

Ignition Control Board Data Error Diagnosis

High Flame Sensor Signal Error Diagnosis

Vent Pressure Switch Fault Diagnosis

Temp. Sensor Failure Error Diagnosis

Air Switch Circuit Closed Error Diagnosis

High Temp. Sensing Error Diagnosis

Ignition Failure Error Diagnosis

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