How much does it cost to fix boiler error code Er 03?

Typical repair cost for the boiler Er 03 fault is £280-450 including labour.

Er 03 High

Boiler Fault Code Er 03

Also written as ER03 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Er 03 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's main control board has encountered an internal electronic failure and is unable to manage the heating process. (As reported on Biasi Advance 25C)

Pick your boiler brand for the Er 03 fix

Biasi Er 03 1 model

Source

Information for the Er 03 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