154 High

Boiler Fault Code 154

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 154 appears across 3 boiler brands and 14 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that water is heating up too quickly or moving in the wrong direction, which usually means the water isn't circulating properly through your radiators. (As reported on Atag iR Regular)

Pick your boiler brand for the 154 fix

Atag 154 4 models Baxi 154 4 models Potterton 154 6 models

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 31 August 2026