How much does it cost to fix boiler error code 384?

Typical repair cost for the boiler 384 fault is £150-350 including labour.

384 High

Boiler Fault Code 384

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 384 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 an internal communication or unexpected electronic fault that is preventing it from starting up safely. (As reported on Main Insul 7)

Pick your boiler brand for the 384 fix

Main 384 1 model

Source

Information for the 384 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 27 April 2026