38 High

Boiler Fault Code 38

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 38 appears across 10 boiler brands and 54 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 it cannot accurately measure its own internal temperature due to a broken or disconnected sensor wire. (As reported on Viessmann Vitodens 333-F)

Pick your boiler brand for the 38 fix

Alpha 38 24 models Dimplex 38 2 models ECA 38 1 model Ferroli 38 1 model Gledhill 38 1 model Halstead 38 5 models Ideal 38 2 models Unical 38 2 models Viessmann 38 12 models Vokera 38 4 models

Source

Information for the 38 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