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Michael EdwardsAug 16, 2025
What to do if my Hayward H400FDNASME Heater shows 'Ignition Failure'?
- CCheryl GarzaAug 16, 2025
If your Hayward Heater is experiencing ignition failure, you should inspect the ignition system for faults.
What to do if my Hayward H400FDNASME Heater 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 H400FDNASME 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 H400FDNASME 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 H400FDNASME 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 H400FDNASME indicates 'Keypad failure'?
If your Hayward Heater indicates a 'Keypad failure', the solution is to replace the keypad.
What to do if my Hayward H400FDNASME 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 H400FDNASME 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 H400FDNASME 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 H400FDNASME 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 H400FDNASME Heater displays 'Blower Vacuum Switch open'?
If your Hayward Heater displays 'Blower Vacuum Switch open', inspect the blower vacuum switch for faults.
Warns about the danger of electric shock and necessary precautions.
Covers initial checks for incoming power and voltage selector plug issues.
Guides through diagnosing and resolving issues related to open FC1 and F2 fuses.
Provides steps to troubleshoot open FC3 and F1 fuses, checking various components.
Outlines the process for diagnosing and resolving issues with an open FC4 fuse.
Details troubleshooting steps for when the service LED displays the 'BD' code.
Provides steps to resolve 'EE' or 'CE' service codes, focusing on communication and board issues.
Guides users through troubleshooting 'IO' and 'SB' service codes related to ignitor or keypad issues.
Explains how to diagnose and resolve 'SF' and 'HS' service codes related to sensor failures.
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