Select a fault code

Pump detected running without adequate water.

Boiler locked out after repeated ignition failures.

Internal electronics fault detected on the control board.

Flow temperature exceeded safe limits.

Flow temperature sensor fault — reading outside normal range.

The burner has failed to ignite or the flame sensor has not detected a flame.

Flue gas thermostat or combustion air supply issue.

Boiler locked out after repeated ignition failures.

Combustion fan not operating correctly.

System pressure approaching minimum — not yet a lockout.

Annual service interval has been exceeded.