Failures / Errors
|
11
A7
and operating LED is flashing
.
DHW (Domestic Hot Water) NTC not installed correctly or defect.
The appliance doesn’ t run in summer mode. It works in winter mode and shows the failure code with alternately.
Control Step
Action
1.
Check the DHW NTC whether it is correct
installed or not.
A7 failure still exist ? -->2.
2.
Check if water NTC damaged or not ?.
B
Switch off the appliance.
B
Pull out NTC cables.
B
Measure resistance of NTC (Ohm).
Is the NTC resistance value OK ?
yes:
B
Change the cable harnness.
B
Switch on the appliance.
A7 failure still exist ? -->3.
no:
-->4.
3.
Check if cable damaged or not.
B
In case of NTC is cahnged :
- Pull the NTC cables out.
- Measure NTC resistance.
- Reconnect the NTC cable.
B
Switch off the appliance.
B
Pull out the 20 poled connector on con-
trol unit.
B
Measure the NTC resistance directly on
20 poled connector. Are the measured
values on NTC and cocnector different
?
yes:
B
Change the cable harnness.
B
Switch on the appliance.
A7 failure still exist ? -->4.
no:
-->4.
4.
Check the DHW circuit in main heat
exchanger whether it is calcified or not.
B
In case of calcification, clean it with special pump. If nec-
essary change the heat exchanger.
A7 failure still exist ? -->5.
5.
Electronic card is defect.
B
Switch off the appliance.
B
Cut mains supply.
B
Change the electronic card.
B
Connect to main supply.
B
Switch on the appliance.
