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. |