1780 High

Boiler Fault Code 1780

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 1780 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 that the water inside the system has reached an excessively high temperature and is shutting down to prevent damage. (As reported on Warmworld Combi)

Pick your boiler brand for the 1780 fix

Warmworld 1780 1 model

Source

Information for the 1780 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