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Hayward Pool Heater Error Codes: H-Series Fault Guide

Quick Answer

Hayward H-Series pool heaters display fault codes including Code 10 or IF (ignition failure), AO (combustion air flow fault), CE (communication error), BD (blower drain or condensate fault), LO (low water flow), BO (blower overheat), and A1 (thermostat or sensor fault). Ignition failures account for the majority of service calls, usually caused by gas supply issues or a dirty flame sensor.

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About These Hayward Poolheater Error Codes

Complete index of Hayward H-Series pool heater fault codes with direct links to each dedicated troubleshooting guide.

Most Common Error Codes

Ignition failure due to gas supply or dirty flame sensor (Code 10, IF)40%

Combustion air blower fault or vent blockage (AO, BO)24%

Insufficient water flow through heater (LO)14%

Condensate drain blockage on condensing models (BD)12%

Control board communication fault (CE)10%

Symptoms You May Notice

Error code or letter code displayed on panel
Heater shuts down mid-cycle with code
Heater will not start and shows fault code
Heater runs briefly then locks out with code

Tools Required for Diagnosis

MultimeterPool pressure gaugeScrewdriver set

How to Identify Your Error Code

Note the exact fault code shown on the display panel before

Note the exact fault code shown on the display panel before touching anything else.

Enter service mode (press Mode + Temperature Up simultaneously

Verify gas supply by checking the manual shutoff valve at the

Check pool water flow

Perform a soft reset

Frequently Asked Questions

Where do Hayward H-Series pool heater codes display?

Fault codes display on the digital control panel on the front of the heater. On H-Series models this is a multi-segment LED display showing 2-character codes. On Universal H-Series with an external controller, the code may also appear on the remote panel.

How do I access stored fault history on a Hayward H-Series?

Press the Mode button and the Temperature Up button simultaneously and hold for 3 seconds. The display will cycle through stored fault codes from recent heat cycles.

What is the most common Hayward pool heater fault code?

Code 10 and IF (ignition failure) are the most common Hayward pool heater faults. They are functionally the same fault - the heater could not establish a flame - and together account for over a third of service calls.

Can I reset a Hayward pool heater fault myself?

Yes. Press Mode to enter standby, wait 30 seconds, and press Mode again to restart the heater. If the fault returns after one cycle, the underlying cause must be fixed before the reset will hold.

Is the Hayward H-Series compatible with pool automation systems?

Yes. The Universal H-Series supports RS-485 communications and integrates with Hayward OmniLogic, Hayward ProLogic, and most third-party automation systems. The CE error code specifically relates to a communication fault in these integrations.

Related Hayward Poolheater Error Codes

Code: 10Hayward Pool Heater Code 10: Ignition Failure Lockout Code: IFHayward Pool Heater IF Error Code Code: AOHayward Pool Heater AO Error Code Code: CEHayward Pool Heater CE Error Code Code: BDHayward Pool Heater BD Error Code Code: LOHayward Pool Heater LO Error Code Code: BOHayward Pool Heater BO Error Code Code: A1Hayward Pool Heater A1 Error Code

Same Fix on Other Brands

Pentair poolheaterPentair Pool Heater Error Codes

Models Known to Experience HUB Errors

This repair applies to most Hayward poolheaters with this error code. Common model numbers include:

H400FDN, H250FDN, H150FDN, H400FDP

Last verified for technical accuracy on March 14, 2026