How much does it cost to fix boiler error code Er 01?

Typical repair cost for the boiler Er 01 fault is £120-£250 including labour.

Er 01 High

Boiler Fault Code Er 01

Also written as ER01 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Er 01 appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has failed to light the flame needed to heat your home and has safely shut itself down as a precaution. (As reported on Biasi Advance Plus)

Pick your boiler brand for the Er 01 fix

Biasi Er 01 2 models Johnson Starley Er 01 1 model

Source

Information for the Er 01 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 7 July 2026