How much does it cost to fix boiler error code ER 10?

Typical repair cost for the boiler ER 10 fault is £120-220 including labour.

ER 10 High

Boiler Fault Code ER 10

Also written as ER10 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code ER 10 appears across 4 boiler brands and 5 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 an issue with the sensor that monitors the exhaust gases, meaning it has safely shut down to prevent unsafe operation. (As reported on Johnson Starley Warmcair DW)

Pick your boiler brand for the ER 10 fix

Biasi ER 10 2 models Ferroli ER 10 1 model Johnson Starley ER 10 1 model Vaillant ER 10 1 model

Source

Information for the ER 10 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