Junkers ZWC 21-3 MFA User Manual

1. No:
↓2.
Yes:
2.
3.
Yes:
Yes:
If C4 still flashing ↓3.
If C4 still flashing ↓4.
No:
No:
↓
↓
3.
4.
4. Electronic card is out of order
Check if APS is working or not
C4IS FLASHING
APS contacts remain closed
Control StepOrder Measure
Switch off the appliance
Cut mains supply
Change the electronic card
Connect to mains supply
Switch on the appliance
6 720 660 238 (2008/07)
38
38 | Troubleshooting
blocked or check if there is condensation
Check if APS hoses are damaged or
in hoses?
If C4 still flashing? ↓2.
Turn off the appliance
Clean and dry APS hoses.
Switch on the appliance
Turn off the appliance
Change APS
Switch on the appliance
Check if the 20 poled connection
cable damaged.
Check 7-8 pin for any intermittent
contact
Change the cable harness
Switch on the appliance.

Junkers ZWC 21-3 MFA Specifications

General

Brand	Junkers
Model	ZWC 21-3 MFA
Category	Boiler
Language	English