How much does it cost to fix boiler error code Er11?

Typical repair cost for the boiler Er11 fault is £120-300 including labour.

Er11 High

Boiler Fault Code Er11

Also written as ER11 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Er11 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 detects a flame when it shouldn't be there, causing the system to shut down safely until the issue is resolved. (As reported on Biasi ActivA 18S)

Pick your boiler brand for the Er11 fix

Biasi Er11 1 model

Source

Information for the Er11 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