68 High

Boiler Fault Code 68

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 68 appears across 4 boiler brands and 11 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 a communication issue with the sensor that monitors the temperature of the exhaust gases, causing it to shut down for safety reasons. (As reported on Ideal Isar M30 / M100)

Pick your boiler brand for the 68 fix

Biasi 68 4 models ECA 68 1 model Ideal 68 1 model Viessmann 68 5 models

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 31 August 2026