Worcester Bosch Fault Code F0

Welcome to the fault-codes section of this site. The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.

F0 and fault indicator LED (and possibly RESET button) are flashing. Internal failure

Step	Check		Action
1.	Button reset flashing?	yes:	▶ Press the reset button for 3 seconds and release it. After releasing the appliance re-starts. ▶ Initiate demand for heat by pressing the boost button for 10 seconds and then press again after 30 seconds to cancel. ▶ Initiate two more demands for heat as above. F0? go to 2
		no:	go to 2
2.	The PCB is damaged.		▶ Make a note of the altered service settings. ▶ Switch OFF the appliance. ▶ Disconnect the boiler power connection. ▶ Change PCB control board. ▶ Reconnect the appliance power connection. ▶ Switch ON the appliance. ▶ Restore service settings previously noted down.

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