How much does it cost to fix boiler error code Communication fault?

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

Communication fault High

Boiler Fault Code Communication fault

Also written as COMMUNICATIONFAULT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

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

Most common meaning Your boiler's main electronic control board has temporarily lost connection with the display screen, meaning the system cannot coordinate heating or hot water. (As reported on Vaillant ecoTEC plus)

Pick your boiler brand for the Communication fault fix

Main Communication fault 1 model Vaillant Communication fault 1 model

Source

Information for the Communication fault 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 31 August 2026