Junkers ZWC 18-3 MFK, Service Manual

Page: 53 / 87

FA
IS FLASHING
Flame detected, after gas istumed off.
Control S tep Order Measures
1. Yes:
Yes:
If FA flashes again,
No:
No:
2.
3.
4. Electronic card is out of order
Clean or if needed
Change electrode set
Restart appliance
Push reset button
Close gas inlet valve
Switch off the appliance
Cut mains supply
Change the elecronic card
Connect to mains supply
Switch on the appliance
Check if electrodes are damaged or
oxidized?
Is the gas valve working?
Turn off the appliance.
Pull out the gas valve cables
Measure resistances
of the gas armature safety valves 1
and 2.
R=160±40?
Connect cables
Turn on the appliance.
Push reset button
Close the gas inlet valve
If FA still flashing
Cut the mains supply of the appliance.
Change the gas valve.
Open the gas inlet valve.
Switch on the mains supply.
Connect cables
Turn on the appliance.
Make sure there is no gas leakage leaking.
Switch on appliance and push reset button
Close the gas inlet valve.
If FA still flashing
Check if main cable harness is
damaged or not? Turn off the appliance.
Cut the mains supply of the appliance.
Change the cable harness
Switch on the mains supply.
Turn on the appliance.
Push reset button
Close gas inlet valve
If FA still flashing
| 53 Troubleshooting
6 720 660 238 (2008/07)
53
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