BoilerFaultCodesWorcester Bosch 232 Fault Code
The Worcester Bosch 232 fault code means: your boiler has been turned off by an external control, such as a smart thermostat, a safety switch, or a heating zone controller.. It appears on 9 Worcester Bosch models in our database.
Technical description: Boiler locked by external switching contact
What causes the Worcester Bosch 232 fault?
This fault occurs when an external device connected to the boiler sends a signal to stop it from firing for safety or control reasons. The most common cause is a full condensate pump that has triggered a safety overflow switch, or a smart thermostat that has lost its connection. It can also be triggered by a faulty wiring center or depleted batteries in your wall controller.
This fault is more frequent during freezing winter temperatures, as frozen external pipes can cause condensate pumps to backup and trigger the safety shut-off.
DIY fix possible
Check that your room thermostat is turned up higher than the current room temperature.Ensure your smart heating hub and internet router are both powered on and connected.Replace the batteries in your wireless room thermostat or wall controller.Check if a safety device, like a condensation pump, has overflowed and tripped the switch.
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Worcester Bosch models that show the 232 fault code
Click a model for the full fault code list and model-specific repair notes.
- 24/28/35 CDi MkII Repair: £100-250
- Greenstar 1000 Repair: £90-180
- Greenstar 12i System Repair: £120-250
- Greenstar 2000 Repair: £100-200
- Greenstar 27CDi Repair: £100-200
- Greenstar 28CDi Repair: £100-200
- Greenstar 4000 Repair: £80-150
- Greenstar 8000 Life & Style Repair: £0-120
- Greenstar CDi Compact Repair: £90-180
Source
Worcester Bosch 232 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch 24/28/35 CDi MkII manual (PDF)
- Worcester Bosch Greenstar 1000 manual (PDF)
- Worcester Bosch Greenstar 12i System manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026