How much does it cost to fix boiler error code 151?

Typical repair cost for the boiler 151 fault is £200-350 including labour.

151 High

Boiler Fault Code 151

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 151 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's internal fan, which is responsible for safely venting fumes, is failing to spin at the correct speed, causing the system to stop working for safety reasons. (As reported on Atag Q 25CR)

Pick your boiler brand for the 151 fix

Atag 151 4 models

Source

Information for the 151 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