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22
Rectifying faults
Error b1
b1 flashing.
Code plug not detected.
Check Action
1. b1 is shown on 2 digit display.
(independent on what is shown on
the text display).
yes: B Power OFF the appliance.
B Fit code plug (correctly), making sure code
number is correct (see Appendix).
B Turn ON the appliance.
b1? ↓2.
no: ↓2.
2. B Activate menu option Show serv-
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.
yes: ↓3.
no: ↓4.
3. Code plug loose, incorrect or defec-
tive.
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.
4. The PCB control board is damaged. 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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