BoilerFaultCodes ERR>CM Medium
Boiler Fault Code ERR>CM
Also written as ERRCM — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ERR>CM appears across 1 boiler brand and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost its electronic link to the remote temperature controller, meaning it can no longer receive instructions on when to turn the heating on or off. (As reported on Alpha E-Tec 24)
Pick your boiler brand for the ERR>CM fix
Source
Information for the ERR>CM 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