204 Low

Boiler Fault Code 204

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 204 appears across 2 boiler brands and 24 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently taking a short break because it has reached its target temperature and is waiting for the water to cool down slightly before firing up again. (As reported on Worcester Bosch GB162)

Pick your boiler brand for the 204 fix

Ariston 204 1 model Worcester Bosch 204 23 models

Source

Information for the 204 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