Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet page 22

Rectifying faults
Error b1
b1
flashing.
Code plug not detected.
Check
1. b1 is shown on 2 digit display.
(independent on what is shown on
the text display).
B Activate menu option Show serv-
2.
ice parameters.
B Select 1.2 Code plug.
B Compare number displayed with
that shown in Appendix.
No number or incorrect number
(last three digits) displayed.
3. Code plug loose, incorrect or defec-
tive.
4. The PCB control board is damaged.
22
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
B Power OFF the appliance.
yes:
B Fit code plug (correctly), making sure code
number is correct (see Appendix).
B Turn ON the appliance.
b1? ↓2.
↓2.
no:
↓3.
yes:
↓4.
no:
B Power OFF the appliance.
B Fit code plug (correctly), making sure code
number is correct (see Appendix).
B Turn ON the appliance.
b1? ↓4.
B Make a note of the altered service function set-
tings (see table 1 on page 7) in order to keep
the altered values.
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
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