Worcester ZBR 8-35 ICS1, Service Booklet

Page: 34 / 52

7 181 465 347 (01.07)
34
Rectifying faults
FA
and flashing.
After appliance switches off flame is detected
Check Action
1. Is condensation trap in condensing
boiler blocked? yes: B Clean condensation trap discharge pipe.
B
Press , does appliance restart???
FA?
↓
2.
no:
↓
2.
2. Electrodes faulty. B Replace electrode assembly.
B
Turn ON the appliance.
B
Press , does appliance restart???
FA?
B
Power OFF the appliance.
↓
3.
3. Problem with flue?
B
Check CO
2
level in combustion
air.
> 0,2 % CO
2
?
yes:
B
Check flue and repair or replace if necessary.
B
Press , does appliance restart???
FA?
B
Power OFF the appliance.
↓
4.
no:
↓
4.
4. The gas valve is damaged.
B
Change the gas valve.
B
Turn ON the appliance.
B Press , does appliance restart???
FA?
B
Power OFF the appliance.
↓
5.
5. Check if the 20-pin connector lead
assembly is damaged.
B
Change the 20-pin connector lead assembly.
B Turn ON the appliance.
B
Press , does appliance restart???
FA?
B
Power OFF the appliance.
↓
6.
6. The PCB control board is damaged.
B
Disconnect the boiler electrical connection.
B
Change PCB control board.
B
Reconnect the boiler electrical connection.
B
Turn ON the appliance.