A9 IS FLASHING
DHW NTC not installed correctly
Control StepOrder Measures
1.
Yes:
No:
2.
Yes:
Yes:
No:
No:
3.
4.
Check if DHW NTC at its position or
not?
Check if water NTC damaged or
not?
Turn off the appliance
Put NTC cables out
Measure resistance of NTC
Check if the cables are damaged or
not?
Turn off the appliance.
If NTC changed:
· - Pull the NTC cables out.
· - Measure the sensor resistance.
- Reconnect the NTC cables
Pull out the 20 poled RAS5
connector on control unit
Measure DHW NTC resistance
Is there deviation of resistance values
between two messurements?
Electronic card is out of order
Change NTC
Restart appliance
Tap water for 3 minutes
If A9 flashes again
Install DHW NTC onits position
Restart appliance
Tap water for 3 minutes
If A9 flashes again
Change cable harness
Restart appliance
Tap water for 3 minutes
If A9 flashes again
Switch off the appliance.
Cut mains supply
Change the electronic card.
Connect to mains supply
Switch on the appliance.
52 | Troubleshooting
6 720 660 238 (2008/07)
52
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