BoilerFaultCodes 183 High
Boiler Fault Code 183
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 183 appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning The boiler has detected a faulty internal wiring connection or a broken sensor that monitors the temperature of the water leaving the unit, which prevents it from heating correctly. (As reported on Viessmann Vitodens 100-W B1GA)
Pick your boiler brand for the 183 fix
Source
Information for the 183 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