BoilerFaultCodes 6 P1 High
Boiler Fault Code 6 P1
Also written as 6P1 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 6 P1 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 struggling to clear exhaust gases due to a sensor sensing a blockage or a faulty fan, which forces the system to stop for safety reasons. (As reported on Ariston Clas System 28)
Pick your boiler brand for the 6 P1 fix
Source
Information for the 6 P1 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