19 - EN
2.10.3 What to do in the event of a malfunction / Troubleshooting
Below are a number of troubleshooting 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
Release the front panel
by unscrewing the screws.
Remove the plastic panel
in front of the control
circuit board
Lift the front panel
from its hinges.
Are the
connections
at the
ComfoAir
correct?
Reconnect the NTC
sensor.
Reconnect the
power to
the ComfoAir.
Yes
No
Yes
No
Is the
resistance of
the NTC sensor
correct?
Replace the
NTC sensor.
Replace the
control circuit
board
.
Set P51 on "0" and
P57 to the correct value.
(see rating plate)
A7
Malfunction
Reset the malfunction
(P74 on 1)
Set P51 on "0"
A6
Malfunction
Yes
No
Was the
temperature
< -27ºC or
> 127ºC?
Reset the malfunction
(P74 on 1)
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Reset the malfunction
(P74 on 1)
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 table for
(NTC) temperature sensors:
Risk of electrocution.
