How much does it cost to fix boiler error code 140?

Typical repair cost for the boiler 140 fault is £180-300 including labour.

140 High

Boiler Fault Code 140

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 140 appears across 3 boiler brands 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 is struggling to switch between heating your radiators and providing hot water to your taps because a internal valve is jammed or faulty. (As reported on Sime Dewy 30/130 HE FS)

Pick your boiler brand for the 140 fix

Atag 140 2 models Baxi 140 1 model Sime 140 1 model

Source

Information for the 140 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