Worcester Bosch Fault Code b1

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.

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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