Select a fault code

The boiler fan is not running at the correct speed or has failed.

The flue gas thermostat has detected an abnormal temperature in the flue.

Fault detected in the gas valve relay circuit.

System pressure has dropped below minimum operating level.

Flow or return temperature sensor fault detected.

Return temperature sensor reading outside normal parameters.

High limit thermostat has tripped due to excessive temperature.

Boiler has overheated and the safety thermostat has cut power.

Boiler failed to ignite after multiple attempts.

Flame signal present with no ignition demand — possible gas valve not seating.