BoilerFaultCodes 38/33A High
Boiler Fault Code 38/33A
Also written as 3833A — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 38/33A 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 is failing to light the pilot flame correctly, meaning it cannot start the main heating process to provide you with hot water or warmth. (As reported on Ferroli Combi 77 FF Popular)
Pick your boiler brand for the 38/33A fix
Source
Information for the 38/33A 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