How much does it cost to fix boiler error code 447?

Typical repair cost for the boiler 447 fault is £120-300 including labour.

447 High

Boiler Fault Code 447

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 447 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 is having trouble controlling the flame correctly, causing it to shut down for safety. (As reported on Viessmann Vitodens 100-W B1GA)

Pick your boiler brand for the 447 fix

Viessmann 447 1 model

Source

Information for the 447 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