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

Typical repair cost for the boiler Er fault is £120-350 including labour.

Er High

Boiler Fault Code Er

Also written as ER — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Er 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 has entered a lockout state to prevent further damage or safety risks, usually following a failed ignition or a recurring internal error. (As reported on Biasi Advance 25C)

Pick your boiler brand for the Er fix

Biasi Er 1 model

Source

Information for the Er 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