Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet page 34

Rectifying faults
Error F7
FA
and
After appliance switches off flame is detected
Check
2. Electrode assembly defective?
B Power OFF the appliance.
B Remove electrode assembly.
Electrode assembly burnt out?
3. Problem with flue?
B Check CO
level in combustion
2
air.
Is CO
level above 0,2 % ?
2
4. The gas valve is damaged.
5. Check if the 20-pin connector lead
assembly is damaged.
6. The PCB control board is damaged.
34
Supplied By www.heating spares.co Tel. 0161 620 6677
flashing.
yes:
no:
Action
B Replace electrode assembly.
B Turn ON the appliance.
B Press
, restart the appliance.
FA? ↓3.
B Check flue, clean if necessary.
B Press
, restart the appliance.
FA? ↓4.
↓4.
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Turn off gas cock.
B Change the gas valve.
B Open the gas cock.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Check appliance for leaks.
B Press
, restart the appliance.
FA?↓5.
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change the 20-pin connector lead assembly.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Press
, restart the appliance.
FA? ↓6.
B Make a note of the altered service settings (see
table 1 on page 7).
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.
7 181 465 347 (05.01)