How much does it cost to fix boiler error code ER 20 + SPANNER?

Typical repair cost for the boiler ER 20 + SPANNER fault is £120-£200 including labour.

ER 20 + SPANNER High

Boiler Fault Code ER 20 + SPANNER

Also written as ER20SPANNER — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code ER 20 + 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 has detected a problem with a temperature sensor that monitors water returning to the unit, which is preventing it from heating properly. (As reported on Johnson Starley Warmcair DW)

Pick your boiler brand for the ER 20 + SPANNER fix

Johnson Starley ER 20 + SPANNER 1 model

Source

Information for the ER 20 + 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