BoilerFaultCodes 5P5 Medium
Boiler Fault Code 5P5
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 5P5 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to detect a consistent supply of gas, which may cause it to fail to ignite or cut out during use. (As reported on Ariston Alteas One)
Pick your boiler brand for the 5P5 fix
Source
Information for the 5P5 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