Medium
232 / D3 on Worcester Bosch Greenstar CDi Compact

Your boiler has been turned off by an external safety device, such as a thermostat, a service switch, or a smart heating controller.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

external cut-off switch activated

From this model's manual
Verified against the Worcester Bosch Greenstar Cdi Compact installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check if any nearby electrical isolation switches for the boiler have been turned off by accident.Ensure your central heating thermostat or smart home controller is set to 'on' and that the battery is not dead.Verify that any external security or safety cut-off switches in your home haven't been tripped.

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