C1 Is Flashing - Junkers ZWE 24-5 MFA Service Manual

36 | Troubleshooting
C1
IS FLASHING
Air pressure switch (APS) opens during operation
Order Control Step
1. Check flue pipe for any blockage or
wrong installation
2. Check if air pressure switch hoses are
installed correctly?
Check if APS hoses are damaged or
3.
blocked or check if there is condensation
in hoses?
4. Check if the fan is operating or not?
There is Check if there is condensation
on in APS hose connection points?
5. Check the mains supply voltage
Is it 230 V?
6.
Check fan cables for damages?
36
Measure
No: ↓ 2.
Yes:
Turn off the appliance
Clean the flue gas pipe or corrent the installation
Switch on the appliance
If C1 still flashing ↓ 2.
↓ 3.
Yes:
No:
Turn off the appliance
Correct the assembly of APS hoses
Switch on the appliance
If C1 still flashing ↓ 4
Yes: Turn off the appliance
Clean and dry APS hoses.
Switch on the appliance
If C1 still flashing? ↓ 4.
No: ↓ 4.
Yes: Turn off the appliance
Clean and dry APS hose connection points on
the fan
If C1 still flashing ↓ 5.
No: ↓ 5.
No: ↓ 6.
Turn off the appliance
Yes:
Change fan
If C1 still flashing ↓ 8.
Yes:
Turn off the appliance
Change fan cable
Switch on the appliance
If C1 still flashing ↓ 9.
No: ↓ 9.
6 720 660 238 (2008/07)