Junkers ZWC 21-3 MFA User Manual

E9 IS FLASHING
Over heat thermostat triggered
Control StepOrder Measure
1. Check if system pressure is > 0,5 bar. Yes: 2.
No:
If E9 is flashing 2.
2. Check if circulation pump is blocked. Yes:
If E9 still flashing 3.
No:
3.
3. Check cable connections for internittent
contact.
Yes:
If E9 still flashing
If E9 still flashing
If E9 still flashing
No:
4.
5.
Yes:
Yes:
No:
No:
Check if the fuses on the electronic
card are working
Fill the system with water
Make sure all air removed from the system
Turn pump propeller manually by help of a screw driver
If problem continues:
Turn off the appliance
Cut mains supply and empty water
Change pump
Fill the system and remove air.
Connect mains supply
Turn on appliance and press reset button
Fix the connections
if error continues.
Change the cable harnees
Change the fuse
Switch on the appliance.
Change termature limiter
Switch on the appliance.
Check 13-14 pin connections on 20
poled RAS 5 connector for intermittent
contact
Check if temperature limiter on heat
exchanger is working
| 41Troubleshooting
6 720 660 238 (2008/07)
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4.
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Junkers ZWC 21-3 MFA Specifications

General

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