BoilerFaultCodes D1 241 High
Boiler Fault Code D1 241
Also written as D1241 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D1 241 appears across 1 boiler brand 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 lost the signal from the sensor that monitors the temperature of the water returning from your radiators, so it has stopped working to prevent damage. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the D1 241 fix
Source
Information for the D1 241 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