101 High

Boiler Fault Code 101

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 101 appears across 4 boiler brands and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has switched itself off because it has reached a temperature that is too high, which usually means the water isn't flowing through the system correctly. (As reported on Ariston Genus ONE+ WiFi)

Pick your boiler brand for the 101 fix

Ariston 101 1 model Atag 101 1 model Baxi 101 1 model Worcester Bosch 101 1 model

Source

Information for the 101 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