BoilerFaultCodesWorcester Bosch D3 232 Fault Code
Also written as D3232 — same fault.
The Worcester Bosch D3 232 fault code means: an external safety device or thermostat has signaled the boiler to stop running, often due to an issue like a full condensate pump or a tripped safety switch.. It appears on 9 Worcester Bosch models in our database.
Technical description: The external switching contact has opened
DIY fix possible
Check if your thermostat or programmer has power and is calling for heat.If you have a condensate pump (a small plastic box near the boiler), check if it is full of water or blocked.Ensure any external emergency 'stop' switches have not been accidentally knocked.
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Gas Safe Register →Worcester Bosch models that show the D3 232 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch D3 232 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026