How much does it cost to fix boiler error code 5406?

Typical repair cost for the boiler 5406 fault is £150-300 including labour.

5406 High

Boiler Fault Code 5406

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 5406 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 reach or maintain the correct water temperature, causing it to shut down for safety. (As reported on Warmworld Combi)

Pick your boiler brand for the 5406 fix

Warmworld 5406 1 model

Source

Information for the 5406 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