Verified manufacturer-source collection
Hayward Pool Heater Error Codes
Choose the code exactly as shown. Meanings and reset procedures can change across model families, display formats and markets.
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AC Official Hayward material describes AC as Blower vacuum switch closed when expected open; if the switch is closed before blower start-up, the control will not start the blower. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: AC caution AO Official Hayward material describes AO as The blower prover switch does not close after the blower starts; the control stops the ignition trial and goes into lockout with the blower continuing to run. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: AO caution bD Official Hayward material describes bD as Internal fault/power-up error. Shown on the initial trial for ignition. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: bD caution CE Official Hayward material describes CE as Communication error: communication between the ignition board and the display board is not established within 3 seconds of power-up, or is lost for 30 seconds after being established. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: CE caution EE Official Hayward material describes EE as EEPROM error: an error was detected in the ignition control circuit board. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: EE caution HF Official Hayward material describes HF as Flame present with the gas valve OFF; the control goes into lockout and the blower runs until the error condition is corrected. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: HF caution HS Official Hayward material describes HS as Water temperature sensing error: (A) the inlet water temperature sensor reports a temperature in excess of 104 degrees F; normal operation resumes 2 minutes after the sensor reports 104 degrees F or less. Or (B) the inlet sensor reports a temperature change faster than 6 degrees F in 60 seconds, indicating a…
Search/display variants: HS caution IF Official Hayward material describes IF as Ignition failure: the control exceeded the maximum number of ignition retries or recycles; the heater shuts down and goes into lockout. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: IF caution IO Official Hayward material describes IO as Igniter open error: the igniter circuit is sensed open while the blower is running (when not in lockout); the control turns off the blower and goes into lockout. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: IO caution LO Official Hayward material describes LO as Limit string open error: if the limit string opens, the heater shuts down and goes into lockout. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: LO caution PF Official Hayward material describes PF as Electrical supply wiring error: displays if 120V polarity is reversed, low voltage is detected, or the ground path is not sufficient. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: PF stop-use Sb Official Hayward material describes Sb as Keypad button stuck closed: one of the keypad buttons is closed (or pressed) for more than 30 seconds; the error code displays but the control continues to function. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: Sb caution SF Official Hayward material describes SF as Thermistor error: an excessive temperature difference between the two thermistors (5 degrees F or more), or an 'out of bounds' condition on both sensors (less than 10 degrees F or greater than 180 degrees F). This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: SF caution