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 31 August 2026

Fault code Er 01 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 has failed to light the flame and has turned itself off for safety reasons, meaning you currently have no heating or hot water. (As reported on Biasi Advance Plus 16S 25S 30S)

Pick your boiler brand for the Er 01 fix

Biasi Er 01 7 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 31 August 2026