How much does it cost to fix boiler error code 154?

Typical repair cost for the boiler 154 fault is £150-250 including labour.

154 High

Boiler Fault Code 154

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 154 appears across 4 boiler brands and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's safety checks have detected that the temperature sensors monitoring the water flow are not reading correctly, so the boiler has shut down to prevent damage. (As reported on Potterton Promax Ultra Combi ErP)

Pick your boiler brand for the 154 fix

Atag 154 3 models Baxi 154 3 models Main 154 1 model Potterton 154 2 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 7 July 2026