How much does it cost to fix boiler error code 380?

Typical repair cost for the boiler 380 fault is £150-250 including labour.

380 Medium

Boiler Fault Code 380

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 380 appears across 2 boiler brands and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is detecting that the incoming water is already hotter than the temperature you have set for your taps, which usually means a sensor is giving a false reading or there is a flow issue. (As reported on Worcester Bosch Greenstar 28CDi)

Pick your boiler brand for the 380 fix

Viessmann 380 1 model Worcester Bosch 380 5 models

Source

Information for the 380 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