Select a fault code

The burner has failed to ignite after the maximum allowed attempts.

The flow temperature has exceeded the safe maximum.

The flame went out unexpectedly during a heating or hot water cycle.

The domestic hot water sensor has failed.

Thermal cut-off safety device has operated.

Boiler has reached dangerously high temperature.

Fan or flue system problem detected.

Flow temperature sensor has failed or is reading incorrectly.

Return temperature sensor has failed.

Main circuit board fault.

Flame detected when burner should be off. Serious fault.

System pressure has dropped below the minimum safe level.

Boiler fired without adequate water flow.

Safety lockout due to excessive temperature.

Condensate drain is blocked or frozen.