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Hayward Pool Heater Error Codes: Meanings & Safe Checks
Choose the code exactly as shown. Meanings and reset procedures can change across model families, display formats and markets.
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AC Hayward pool heater AC means Blower vacuum switch closed when expected open; if the switch is closed before blower start-up, the control will not start the… Search/display variants: AC caution AO Hayward pool heater AO means The blower prover switch does not close after the blower starts; the control stops the ignition trial and goes into lockout… Search/display variants: AO caution bD Hayward pool heater bD means Internal fault/power-up error. Shown on the initial trial for ignition. Search/display variants: bD caution CE Hayward pool heater CE means Communication error: communication between the ignition board and the display board is not established within 3 seconds of… Search/display variants: CE caution EE Hayward pool heater EE means EEPROM error: an error was detected in the ignition control circuit board. Search/display variants: EE caution HF Hayward pool heater HF means Flame present with the gas valve OFF; the control goes into lockout and the blower runs until the error condition is corrected. Search/display variants: HF caution HS Hayward pool heater HS means Water temperature sensing error: (A) the inlet water temperature sensor reports a temperature in excess of 104 degrees F;… Search/display variants: HS caution IF Hayward pool heater IF means Ignition failure: the control exceeded the maximum number of ignition retries or recycles; the heater shuts down and goes into… Search/display variants: IF caution IO Hayward pool heater IO means Igniter open error: the igniter circuit is sensed open while the blower is running (when not in lockout); the control turns off… Search/display variants: IO caution LO Hayward pool heater LO means Limit string open error: if the limit string opens, the heater shuts down and goes into lockout. Search/display variants: LO caution PF Hayward pool heater PF means Electrical supply wiring error: displays if 120V polarity is reversed, low voltage is detected, or the ground path is not… Search/display variants: PF stop-use Sb Hayward pool heater Sb means Keypad button stuck closed: one of the keypad buttons is closed (or pressed) for more than 30 seconds; the error code displays… Search/display variants: Sb caution SF Hayward pool heater SF means Thermistor error: an excessive temperature difference between the two thermistors (5 degrees F or more), or an 'out of bounds'… Search/display variants: SF caution