Junkers ZWC 24-3 MFK User Manual

AA IS FLASHING
Plate heat exchanger blocked or DHW NTC is not at its position
Control StepOrder Measure
1.
2.
3.
D5
D7
IPMx modules NTC is defective
The gas valve cables not connected
1.
1.
IS FLASHING
IS FLASHING
Control StepOrder
Order
Control Step
Measures
Measures
Check if DHW NTC at its position or
not?
Check if plate heat exchanger (PHE)
blocked or not?
Electronic card is out of order
Check IPMx module NTC
Check cable connections to gas valve
Change flow NTC on IPMx module
Connect cables to gas valve
Yes:
Yes:
No:
No:
Install DHW NTC onits position
Restart appliance
Tap water for 3 minutes
If AA flashes again
Clean PHE or replace if needed
Restart appliance
Switch off the appliance
Cut mains supply
Change the electronic card
Connect to mains supplyu
Switch on the appliance
| 55Troubleshooting
6 720 660 238 (2008/07)
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2.
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Junkers ZWC 24-3 MFK Specifications

General

Brand	Junkers
Model	ZWC 24-3 MFK
Category	Boiler
Language	English