Supplied By www.heating spares.co Tel. 0161 620 6677
RECTIFYING FAULTS
8 716 115 748 (2009/09)
34
5
Has the bus module been replaced
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
6
The PCB control board is faulty
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
A8
and fault indicator LED are flashing.
Bus communication to the programmer interrupted (set value not received)
Check
Action
Tab. 17 A8 Error codes