BoilerFaultCodes 436 High
Boiler Fault Code 436
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 436 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because a sensor that monitors the water temperature has disconnected or broken. (As reported on Ideal Response SE)
Pick your boiler brand for the 436 fix
Source
Information for the 436 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 27 April 2026