How much does it cost to fix boiler error code 448?

Typical repair cost for the boiler 448 fault is £140-320 including labour.

448 High

Boiler Fault Code 448

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 448 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 struggling to correctly detect that the flame has ignited, causing it to shut down for safety purposes. (As reported on Viessmann Vitodens 100-W B1GA)

Pick your boiler brand for the 448 fix

Viessmann 448 1 model

Source

Information for the 448 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