Worcester CDi Combi N.G Service Booklet page 34

RECTIFYING FAULTS
A8
and fault indicator LED are flashing.
Bus communication to the programmer interrupted (set value not received)
Check
5 Has the bus module been replaced
6 The PCB control board is faulty
Tab. 17 A8 Error codes
34
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Action
yes: A8? go to 6
no: B Switch off appliance
B Disconnect electrical power
B Replace bus module
B Reconnect appliance power
B Switch on appliance
A8? go to 5
B Reconnect electrical power
B Switch on appliance
B Make a note of the service function settings
B Switch off appliance
B Disconnect electrical power
B Change PCB control board
B Reconnect electrical power
B Switch on appliance
B Restore service settings noted previously
8 716 115 748 (2009/09)