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8 | Failures / Errors
3.3
Failure codes and corrections steps
A2
and operating LED is flashing
Combustion chamber NTC failure (behind burner) : when the temperature by CC NTC reached to limit
Control Step
1.
Check if combustion chamber NTC dam-
aged or not and the position.
B Switch off the appliance.
B Pull the NTC cables out.
B Measure NTC resistance.
Are the values correct ? (see NTC val-
ues)
2.
Check if cable damaged or not.
B Switch off the appliance.
B In case of NTC is cahnged :
- Pull the NTC cables out.
- Measure NTC resistance.
- Reconnect the NTC cable.
B Pull out the 20 poled connector on
control unit.
B Measure the NTC resistance directly
on 20 poled connector. Are the meas-
ured values on NTC and cocnector dif-
ferent ?
3.
Is there any blockage on flue gas pipe?
4.
Is the correct MAP (fan speed) value
according flue gas pipe length choosen ?
5.
Is fan running correct ?
.
Action
B Check the cable connection.
yes:
A2 failure still exist ? -->2.
no:
B Change the NTC.
B Connect the cable.
B Switch on the appliance.
A2 failure still exist ? -->2.
yes:
B Change the cable harness.
B Switch on the appliance.
A2 failure still exist ? -->3.
no:
-->3.
B Remove the blockage.
yes:
A2 failure still exist ? -->4.
no:
-->4.
no:
B Adjust correct MAP value according flue gas pipe
length and diameter. See capitel 7.2.
A2 failure still exist ? -->5.
yes:
-->5.
no:
B Change the fan.
A2 failure still exist ? -->6.
yes:
-->6.
1)
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