d4 IS FLASHING
A fast temperature increase detected inCH. (> 40 K / secs)
Control StepOrder Measure
1.
Yes:
Yes:
↓2.
No:
Fill the system with water.
If d4 still flashing? ↓2.
If d4 still flashing? ↓3.
2. Is there air in the system?
Check if there is enough conducting
paste between CH NTC
and pipe (for ZWE-5 types)
↓3.
No:
3.
5.
6.
Yes:
Yes:
Yes:
↓4.
↓6.
No:
No:
No:
Remove the air in system.
Add conducting paste between CH NTC and pipe.
If d4 still flashing? ↓4.
If d4 still flashing? ↓5.
If d4 still flashing? ↓5.
If d4 still flashing? ↓6.
4. Pull out connections of CH NTC
Measure the resistance ans see if it is
within specified limits.
Check if water is circulated.
Electronic card is out of order.
Check system pressure on
manometer.
Is the system pressure > 0,5 bar?
Check cable connections (especially on RAS 5;20
way connector) If needed replace cable harness
Change CH NTC
Check and clean pump, filters and return and
flow valves
Turn of the appliance.
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)
35
| 35Troubleshooting
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