BoilerFaultCodes 232 / D3 Medium
Boiler Fault Code 232 / D3
Also written as 232D3 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 232 / D3 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has been turned off by an external safety device, such as a thermostat, a service switch, or a smart heating controller. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 232 / D3 fix
Source
Information for the 232 / D3 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