BoilerFaultCodes 154 High
Boiler Fault Code 154
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 154 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because it cannot move water through the system effectively, likely due to a circulation problem or a blockage. (As reported on Atag Q 25CR)
Pick your boiler brand for the 154 fix
Source
Information for the 154 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