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Australia's Pool Heater Specialists

Hayward H400 Heater Parts

Hayward H400 heater parts are used to repair and maintain Hayward H400 gas pool heaters. Common replacement parts include thermistors, ignition modules, gas valves, pressure switches and control boards.

This collection includes genuine and compatible Hayward H400 gas heater parts designed to restore heating performance, resolve faults and extend heater lifespan.

If your Hayward H400 heater is not operating correctly, view our troubleshooting guides, return to our Hayward gas heater parts hub or book a pool heater repair.

Read More About Hayward H400 Heater Parts

Common Hayward H400 Heater Parts

  • Thermistors and sensors
  • Ignition modules and flame controls
  • Gas valves and burners
  • Control boards
  • Pressure switches

Common Hayward H400 Heater Faults

  • Ignition failure
  • Temperature control issues
  • Lockout faults
  • Gas flow problems
  • Water pressure faults

Hayward H400 Heater Parts – FAQs

What parts fail in Hayward H400 heaters?
Common failures include thermistors, gas valves and control boards.

Is the H400 heater repairable?
Yes, most faults can be fixed by replacing individual components.

How do I confirm my heater model?
Check the data plate on the unit for the H400 model number.

Can I install parts myself?
Basic parts can be replaced, but gas and electrical components require a qualified technician.

  • AstralPool IXI IXI 200 IXI 370 Fuel Orifice Kit, To Convert A Natural To A Propane - Heater Spare Part

    Hayward Gas Heater High Limit Sensor 135F

    $140.80
    $140.80
    $140.80
    $140.80

    Hayward High Limit Sensor 135F — Genuine outlet water temperature safety switch for FD-series heaters. Protects the heat exchanger by shutting down...

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    $140.80
    $140.80
    $140.80
    $140.80
  • AstralPool IXI IXI 200 IXI 370 Fuel Orifice Kit, To Convert A Natural To A Propane - Heater Spare Part

    Hayward Gas Heater Gas Valve Natural – FD

    $627.00
    $627.00
    $627.00
    $627.00

    Hayward Gas Valve Natural – FD — Genuine natural gas valve for Hayward FD heaters. Factory-calibrated for stable fuel delivery and safe combustion....

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    $627.00
    $627.00
    $627.00
    $627.00
  • AstralPool IXI IXI 200 IXI 370 Fuel Orifice Kit, To Convert A Natural To A Propane - Heater Spare Part

    Hayward Gas Heater Flame Sensor

    $159.00
    $159.00
    $159.00
    $159.00

    Hayward Flame Sensor — OEM flame rectification sensor for Hayward FD heaters. Confirms proper burner flame for safe operation and reliable ignition...

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    $159.00
    $159.00
    $159.00
    $159.00
  • AstralPool IXI IXI 200 IXI 370 Fuel Orifice Kit, To Convert A Natural To A Propane - Heater Spare Part

    Hayward Gas Heater Display Board (PCB Only) – 50Hz FD

    $783.20
    $783.20
    $783.20
    $783.20

    Hayward Heater Display Board (PCB Only) – 50Hz FD — Genuine display PCB for Hayward FD heaters. Restores clear readout and responsive button inputs...

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    $783.20
    $783.20
    $783.20
    $783.20
  • AstralPool IXI IXI 200 IXI 370 Fuel Orifice Kit, To Convert A Natural To A Propane - Heater Spare Part

    Hayward Gas Heater Direct Spark Ignition Control (Module)

    $511.50
    $511.50
    $511.50
    $511.50

    Hayward Direct Spark Ignition Control — OEM ignition module that manages spark, flame proving, and safety timing on FD heaters. Function: Control...

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    $511.50
    $511.50
    $511.50
    $511.50
  • AstralPool IXI IXI 200 IXI 370 Fuel Orifice Kit, To Convert A Natural To A Propane - Heater Spare Part

    Hayward Gas Heater Direct Spark Igniter – 50Hz FD

    $247.50
    $247.50
    $247.50
    $247.50

    Hayward Direct Spark Igniter – 50Hz FD — OEM DSI igniter that lights the burner on Hayward FD heaters. Delivers reliable starts and consistent igni...

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    $247.50
    $247.50
    $247.50
    $247.50
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Fuse Service Kit

    $96.51
    $96.51
    $96.51
    $96.51

    The Hayward Fuse Service Kit is a genuine Hayward replacement part that is an essential component for correct heater operation. Designed specifica...

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    $96.51
    $96.51
    $96.51
    $96.51
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Flue Collector Side Panel

    $154.09
    $154.09
    $154.09
    $154.09

    The Hayward Flue Collectorside Panel is a genuine Hayward replacement part that forms part of the heater cabinet, providing protection and weather ...

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    $154.09
    $154.09
    $154.09
    $154.09
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Flame Sensor

    $186.26
    $186.26
    $186.26
    $186.26

    The Hayward Flame Sensor is a genuine Hayward replacement part that detects whether the burner flame is present during operation. Designed specific...

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    $186.26
    $186.26
    $186.26
    $186.26
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Field Wiring Panel

    $214.90
    $214.90
    $214.90
    $214.90

    The Hayward Field Wiring Panel is a genuine Hayward replacement part that forms part of the heater cabinet, providing protection and weather resist...

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    $214.90
    $214.90
    $214.90
    $214.90
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Exhaust Gas Temperature Limit

    $65.37
    $65.37
    $65.37
    $65.37

    The Hayward Exhaust Gas Temperature Limit is a genuine Hayward replacement part that provides a safety cutoff to prevent overheating damage. Design...

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    $65.37
    $65.37
    $65.37
    $65.37
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Display Board Only - 50Hz

    $934.51
    $934.51
    $934.51
    $934.51

    The Hayward Display Board Only - 50hz is a genuine Hayward replacement part that manages all electronic functions and heater operation. Designed s...

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    $934.51
    $934.51
    $934.51
    $934.51
  • Hayward_Direct_Spark_Igniter_Controller

    Hayward Direct Spark Ignition Control

    $665.33
    $665.33
    $665.33
    $665.33

    The Hayward Direct Spark Ignition Controll is a genuine Hayward replacement part that ignites the gas burner to start your pool heater. Designed sp...

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    $665.33
    $665.33
    $665.33
    $665.33
  • Hayward_Direct_Spark_Igniter_-_50_HZ_FD

    Hayward Direct Spark Igniter - 50Hz

    $294.81
    $294.81
    $294.81
    $294.81

    The Hayward Direct Spart Igniter - 50hz is a genuine Hayward replacement part that ignites the gas burner to start your pool heater. Designed spec...

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    $294.81
    $294.81
    $294.81
    $294.81
  • Hayward_Combustion_Blower_Fan_-_H150-400FDAU

    Hayward Combustion Blower

    $712.41
    $712.41 - $1,479.03
    $712.41
    $712.41

    The Hayward Combustion Fan H150 H250 H400 is a genuine Hayward replacement part that supplies combustion air to the burner for efficient gas heatin...

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    $712.41
    $712.41 - $1,479.03
    $712.41
    $712.41
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  • Hayward Bypass Cartridge Kit

    $118.39
    $118.39
    $118.39
    $118.39

    The Hayward Bypass Cartridge Kit is a genuine Hayward replacement part that regulates water flow through the heat exchanger to prevent overheating....

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    $118.39
    $118.39
    $118.39
    $118.39
  • Hayward_Burner_Orifice_Natural_LPG_FD

    Hayward Burner Orifice Natural or LPG

    $142.95
    $142.95
    $142.95
    $142.95

    The Hayward Burner Orificenatural is a genuine Hayward replacement part that combusts the gas to generate heat for the pool water. Designed specif...

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    $142.95
    $142.95
    $142.95
    $142.95
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  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Burner Kit

    $907.78
    $907.78
    $907.78
    $907.78

    The Hayward Burner Kit is a genuine Hayward replacement part that combusts the gas to generate heat for the pool water. Designed specifically for ...

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    $907.78
    $907.78
    $907.78
    $907.78
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward Fan Vacuum Switch

    $156.00
    $156.00
    $156.00
    $156.00

    The Hayward Fan Vacuum Switch -H150/250 H400 is a genuine Hayward replacement part that supplies combustion air to the burner for efficient gas hea...

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    $156.00
    $156.00
    $156.00
    $156.00
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  • Hayward_Blower_Inlet_Baffle

    Hayward Blower Inlet Baffle

    $68.45
    $68.45 - $85.64
    $68.45
    $68.45

    The Hayward Blower Inlet Baffle - H150 H250 H400 is a genuine Hayward replacement part that supplies combustion air to the burner for efficient gas...

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    $68.45
    $68.45 - $85.64
    $68.45
    $68.45
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  • Hayward_Gas_Heater_Bezel_Keypad_Assembly

    Hayward Bezel & Keypad Assembly

    $299.23
    $299.23
    $299.23
    $299.23

    The Hayward Bezel & Keypadassembly is a genuine Hayward replacement part that forms part of the heater cabinet, providing protection and weathe...

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    $299.23
    $299.23
    $299.23
    $299.23
  • Hayward_Gas_Heater_Base_Leg_-_FD

    Hayward Base Leg

    $93.42
    $93.42
    $93.42
    $93.42

    The Hayward Base Leg - is a genuine Hayward replacement part that forms part of the heater cabinet, providing protection and weather resistance. D...

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    $93.42
    $93.42
    $93.42
    $93.42
  • Hayward H150 Wiring Harness 50Hz H150 - Gas Heater Spare Part

    Hayward 240V Electrical Supply Cord

    $177.44
    $177.44
    $177.44
    $177.44

    The Hayward 240v Electrical Supply Cord is a genuine Hayward replacement part that is an essential component for correct heater operation. Designed...

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    $177.44
    $177.44
    $177.44
    $177.44