How much does it cost to fix boiler error code ER 03 + Reset?

Typical repair cost for the boiler ER 03 + Reset fault is £100-£250 including labour.

ER 03 + Reset High

Boiler Fault Code ER 03 + Reset

Also written as ER03RESET — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code ER 03 + Reset appears across 2 boiler brands and 12 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 a problem with how it is getting rid of exhaust gases or taking in fresh air, causing it to shut down for safety. (As reported on Biasi M96E)

Pick your boiler brand for the ER 03 + Reset fix

Biasi ER 03 + Reset 11 models Johnson Starley ER 03 + Reset 1 model

Source

Information for the ER 03 + Reset 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