BoilerFaultCodes COM High
Boiler Fault Code COM
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code COM appears across 1 boiler brand and 7 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 is having trouble talking to the control panel, meaning the unit cannot receive instructions to provide heating or hot water. (As reported on Vokera Vision S)
Pick your boiler brand for the COM fix
Source
Information for the COM 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