How much does it cost to fix boiler error code ER 12 + SPANNER?

Typical repair cost for the boiler ER 12 + SPANNER fault is £90-180 including labour.

ER 12 + SPANNER High

Boiler Fault Code ER 12 + SPANNER

Also written as ER12SPANNER — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code ER 12 + SPANNER 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's internal sensor has detected an unusual temperature reading on the pipe returning from your radiators, suggesting a sensor fault or water flow issue. (As reported on Johnson Starley Warmcair DW)

Pick your boiler brand for the ER 12 + SPANNER fix

Johnson Starley ER 12 + SPANNER 1 model

Source

Information for the ER 12 + SPANNER 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