How much does it cost to fix boiler error code 393?

Typical repair cost for the boiler 393 fault is £100-250 including labour.

393 Medium

Boiler Fault Code 393

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 393 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 lost communication with its room thermostat, meaning it cannot detect the temperature of your home to know when to heat up. (As reported on ECA FELiS FL 50 HM)

Pick your boiler brand for the 393 fix

ECA 393 1 model

Source

Information for the 393 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