How much does it cost to fix boiler error code 385?

Typical repair cost for the boiler 385 fault is £300-500 including labour.

385 High

Boiler Fault Code 385

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 385 appears across 3 boiler brands and 3 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 an internal electrical fault within its main control board which is preventing it from safely lighting the burner. (As reported on Viessmann Vitodens 100-W B1GA)

Pick your boiler brand for the 385 fix

ECA 385 1 model Ideal 385 1 model Viessmann 385 1 model

Source

Information for the 385 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