EN - 22
2.10.3 What to do in the event of a malfunction / Trouble shooting
Below are a number of trouble-shooting tips for the malfunction alerts described previously which can appear on
the digital operating device in the event of a malfunction.
A1 /
A2 / A3 / A4
NTC sensor
T1 / T2 / T3 / T4
is defective
Remove the handles
from the ComfoAir.
Remove the filters from
the ComfoAir.
Slide the front panel
upwards and remove
the front panel from
the ComfoAir.
Release the cover panel
by unscrewing the
screws.
Remove the screw
from the electronics
carriage and pull the
electronics carriage
carefully forwards.
Remove the
cover panel.
Reconnect the
NTC sensor.
Reconnect the
power to
the ComfoAir.
Yes
No
Yes
No
Replace the
NTC sensor.
Replace the
control circuit
board
.
Yes
No
Was the
temperature
< -27ºC or
> 127ºC?
Reset the unit
(P74 on 1)
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Release the front panel
by unscrewing the
screws.
Are the
connections
at the ComfoAir
correct?
Is the
resistance of
the NTC sensor
correct?
Resistance [KΩ]
MIN.
MID.
MAX.
10
19,.570
19,904
20,242
15
15,485
15,712
15,941
18
13,502
13,681
13,861
19
12,906
13,071
13,237
20
12,339
12,491
12,644
21
11,801
11,941
12,082
22
11,291
11,420
11,550
25
9,900
10,000
10,100
30
7,959
8,057
8,155
Temperature
[°C]
Resistance tabel for
(NTC) temperature sensors:
