How much does it cost to fix boiler error code 540?

Typical repair cost for the boiler 540 fault is £120-250 including labour.

540 High

Boiler Fault Code 540

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 540 appears across 1 boiler brand and 1 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 waste water (condensate) is not draining away correctly, which is causing the burner to shut down to prevent damage. (As reported on Viessmann Vitodens 100-W B1GA)

Pick your boiler brand for the 540 fix

Viessmann 540 1 model

Source

Information for the 540 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