How much does it cost to fix boiler error code 320?

Typical repair cost for the boiler 320 fault is £120-200 including labour.

320 Medium

Boiler Fault Code 320

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 320 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 is struggling to accurately measure the temperature of the water used for your taps and shower, so it has stopped heating it to prevent overheating. (As reported on ECA FELiS FL 50 HM)

Pick your boiler brand for the 320 fix

ECA 320 1 model

Source

Information for the 320 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