BoilerFaultCodes 68 High
Boiler Fault Code 68
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 68 appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost its connection to the sensor that measures the water temperature coming back into the unit, which often results in the system shutting down for safety. (As reported on Viessmann Vitodens 100-W)
Pick your boiler brand for the 68 fix
Source
Information for the 68 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