Worcester CDi Combi N.G Service Booklet page 48

RECTIFYING FAULTS
F0
and fault indicator LED (and possibly RESET button) are flashing.
Internal failure
Check
1. Button reset flashing?
2. The PCB is damaged.
Tab. 26 F0 Error codes
48
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
yes: B Press the reset button for 3 seconds and release it.
After releasing the appliance re-starts.
B Initiate demand for heat by pressing
seconds and then press again after 30 seconds to
cancel.
B Initiate two more demands for heat as above.
F0? go to 2
no: go to 2
B Make a note of the altered service settings.
B Switch OFF the appliance.
B Disconnect the boiler power connection.
B Change PCB control board.
B Reconnect the appliance power connection.
B Switch ON the appliance.
B Restore service settings previously noted down.
8 716 115 748 (2009/09)
button for 10