Hayward Error Codes

Find troubleshooting guides for all Hayward error codes.

10 error codes across 1 appliance types

Poolheater

Code	Meaning	Severity
10	The heater failed to establish or sustain a flame after multiple ignition attempts and has entered a hard lockout. high	high
A1	The water temperature sensor (thermostat sensor) is reading outside its valid range, indicating a failed sensor, a wiring fault, or actual water temperature outside operating limits. moderate	moderate
AO	The combustion air pressure switch did not close during startup, indicating insufficient combustion air flow or a restricted vent. high	high
BD	A blower drain or combustion air pressure fault, most commonly caused by a blocked condensate drain on condensing H-Series models or a combustion air pressure switch fault. moderate	moderate
BO	The combustion blower motor or combustion chamber has exceeded safe temperature limits, triggering the thermal overheat safety lockout. high	high
CE	A communication failure between the heater control board and the display panel, remote controller, or pool automation system. moderate	moderate
HUB	Reference guide covering all Hayward H-Series pool heater error codes and fault indicators. low	low
IF	Ignition Failure - the heater attempted to light the burner multiple times and could not establish or hold a flame. high	high
LO	Water flow through the heater has fallen below the minimum required threshold, triggering a safety lockout to protect the heat exchanger. high	high
NOT-HEATING	LO, HI, IF, and Bypass Valve Fixes medium	medium