BoilerFaultCodes ALL 35 High
Boiler Fault Code ALL 35
Also written as ALL35 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code ALL 35 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 components are currently unable to communicate with each other, which has caused the system to stop functioning as a safety precaution. (As reported on Sime Murelle HE Regular)
Pick your boiler brand for the ALL 35 fix
Source
Information for the ALL 35 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