b1 and fault indicator LED are flashing – Code plug not detected.

 Check Action
1 Select in the second service level the service function 8.b (Code plug).
B Compare number displayed with that shown in Appendix (only digits no. 7 up to 10 of order no.). No number or incorrect number displayed.
B Exit the service function.
yes:go to 2
no:go to 3
2.Code plug loose, incorrect or defective.- Switch OFF the appliance.
- Fit code plug (correctly), making sure code number
is correct (see Appendix).
- Switch ON the appliance.

b1? go to 3
3.The PCB is damaged.-Make a note of the altered service function settings (see table 6 on page 18) in order to keep the altered values.
- 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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