BoilerFaultCodes P35 Low
Boiler Fault Code P35
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code P35 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is temporarily waiting to start because it is part of a larger heating system setup where multiple units are programmed to ignite in a specific sequence to avoid overloading the system. (As reported on Alpha Pro Tec Plus)
Pick your boiler brand for the P35 fix
Source
Information for the P35 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