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Chad DavidsonAug 16, 2025
What to do if my Hayward H350FDP shows 'Ignition Failure'?
- MMaureen YatesAug 16, 2025
If your Hayward Heater is experiencing ignition failure, you should inspect the ignition system for faults.
To Next PageTo Next PageWhat to do if my Hayward H350FDP shows 'Ignition Failure'?
If your Hayward Heater is experiencing ignition failure, you should inspect the ignition system for faults.
What to do if my Hayward H350FDP Heater displays a 'Communication Error Between Control Module and Display Interface Assembly'?
If your Hayward Heater shows a communication error between the control module and the display interface assembly, verify the connections between these components.
What to do if my Hayward H350FDP Heater displays 'Temperature Sensor (thermistor) input failure'?
If your Hayward Heater shows a 'Temperature Sensor (thermistor) input failure', check the temperature sensor and replace it if necessary.
What to do if my Hayward H350FDP Heater shows 'Ignitor Circuit Open'?
If your Hayward Heater displays 'Ignitor Circuit Open', check the ignitor circuit for continuity.
What to do if my Hayward Heater indicates 'Keypad failure'?
If your Hayward Heater indicates a 'Keypad failure', the solution is to replace the keypad.
What to do if my Hayward H350FDP displays 'Maximum return water temperature exceeded and / or rapid water temperature rise'?
If your Hayward Heater displays 'Maximum return water temperature exceeded and / or rapid water temperature rise', check the water temperature sensors and system settings.
What to do if my Hayward Heater shows 'Flame present with Gas Valve not energized'?
If your Hayward Heater shows 'Flame present with Gas Valve not energized', check the gas valve and ignition system.
What to do if my Hayward H350FDP Heater displays 'Voltage polarity reversed, low voltage detected'?
If your Hayward Heater displays 'Voltage polarity reversed, low voltage detected', correct the polarity and ensure proper voltage is supplied.
What to do if my Hayward H350FDP Heater shows 'Water Pressure Switch, Vent Pressure Switch, or Temperature Limit Switch Fault'?
If your Hayward Heater indicates 'Water Pressure Switch, Vent Pressure Switch, or Temperature Limit Switch Fault', inspect all associated switches for proper operation.
What to do if my Hayward H350FDP Heater displays 'Blower Vacuum Switch open'?
If your Hayward Heater displays 'Blower Vacuum Switch open', inspect the blower vacuum switch for faults.
General| Model | H350FDP |
|---|---|
| Category | Heater |
| Heating Capacity | 350, 000 BTU |
| Fuel Type | Natural Gas or Propane |
| Thermostat | Electronic |
| Weight | 150 lbs |
| Efficiency | 80% |
| BTU Input | 350, 000 BTU |
| Heat Exchanger Material | Cupro-Nickel |
| Warranty | 1 Year |
| Ignition Type | Direct Spark |
| Water Flow Rate | 30-120 GPM |
Warning about fire or explosion if instructions are not followed, causing property damage, injury, or death.
Instructions for responding to gas leaks, emphasizing safety precautions and immediate actions.
Key safety guidelines for installation, operation, and maintenance of the heater.
Details on risks associated with suction outlets, including types of entrapment and prevention measures.
Overview of the manual's content and recommendation to read it before use.
Brief overview of the heater's limited warranty terms and coverage.
Guidelines for balancing pool/spa water chemistry to protect the heat exchanger.
Importance of maintaining adequate water flow for heater operation and protection.
Detailed table of recommended chemical levels and their effects.
Requirements for installing a chlorinator downstream of the heater with a check valve.
Procedure for using a bypass valve during initial balancing and for service.
Instructions for starting, stopping, and operating the heater.
Critical safety warnings and procedures to follow before attempting to light the appliance.
Step-by-step guide for starting and operating the heater safely.
Explanation of STANDBY, SPA, and POOL modes for temperature control.
Procedure to change the temperature display between Fahrenheit and Celsius.
Guidelines for protecting the heater from freezing temperatures during cold spells.
Steps for safely starting the heater after winterization, recommending professional consultation.
Table listing error codes, their descriptions, and information for troubleshooting.
Details on what the limited warranty covers, including defects and leaks.
Explains limitations on implied warranties and liability for damages.
Lists specific conditions and exceptions that void the warranty.
Instructions for initiating a warranty claim, including contact information.
Manufacturer's liability limits and safety warnings regarding materials near the heater.
