BoilerFaultCodes P38 High
Boiler Fault Code P38
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code P38 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 having difficulty reading the water temperature in your heating system, which has caused it to stop working to prevent overheating. (As reported on Alpha Pro Tec 24)
Pick your boiler brand for the P38 fix
Source
Information for the P38 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