BoilerFaultCodes Tank overheat High
Boiler Fault Code Tank overheat
Also written as TANKOVERHEAT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Tank overheat 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 hot water tank has reached an unsafely high temperature, and the boiler has shut down to prevent damage or scalding. (As reported on Worcester Bosch Greenstar i)
Pick your boiler brand for the Tank overheat fix
Source
Information for the Tank overheat 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