How much does it cost to fix boiler error code 431?

Typical repair cost for the boiler 431 fault is £120-220 including labour.

431 High

Boiler Fault Code 431

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 431 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 an issue with the sensor that measures the temperature of the internal water flow, causing it to shut down for protection. (As reported on ECA FELiS FL 50 HM)

Pick your boiler brand for the 431 fix

ECA 431 1 model

Source

Information for the 431 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