F61 High

Boiler Fault Code F61

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code F61 appears across 3 boiler brands and 20 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected an internal communication failure between the main control board and the gas valve, meaning it cannot safely light the flame. (As reported on Glow-worm Ultracom 24cx 30cx)

Pick your boiler brand for the F61 fix

Ferroli F61 3 models Glow-worm F61 9 models Heatline F61 8 models

Source

Information for the F61 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026