How much does it cost to fix boiler error code 4)?

Typical repair cost for the boiler 4) fault is £120-450 including labour.

4) High

Boiler Fault Code 4)

Also written as 4 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 4) appears across 2 boiler brands and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's computer has lost its specific configuration settings, meaning it doesn't know how to operate correctly and has shut down as a precaution. (As reported on Remeha Quinta 115)

Pick your boiler brand for the 4) fix

Biasi 4) 2 models Remeha 4) 6 models

Source

Information for the 4) 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