BoilerFaultCodes C 61 High
Boiler Fault Code C 61
Also written as C61 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code C 61 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal computer brain has temporarily lost its ability to talk to the control sensors and requires a manual power restart. (As reported on Atag Sov.)
Pick your boiler brand for the C 61 fix
Source
Information for the C 61 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 7 July 2026