18 - EN
2.10.2What 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.
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:
A1 /
A2 / A3 / A4
NTC sensor
T1 / T2 / T3 / T4
is defective
Remove the filter caps
from the ComfoAir.
Lift the front panel
from its hinges.
Remove the plastic
panel in front of
the control circuit board
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
.
A7
Malfunction
Reset the unit
(P74 on 1)
Set P51 on "0"
A6
Malfunction
Yes
No
Was the
temperature
< -27
ºC 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.
Reset the unit
(P74 on 1)
Are the
connections
at the ComfoAir
correct?
Set P51 on "0" and
P57 to the correct value.
(see rating plate)
Risk of electrocution.
A1 /
A2 / A3 / A4
NTC sensor
T1 / T2 / T3 / T4
is defective
Release the front panel
by unscrewing the
screws.
Remove the filter caps
from the ComfoAir.
Remove the metal barrier
in front of the control
circuit board by
unscrewing the screw
Lift the front panel
from its hinges.
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
< -16.6°F or
>260.6°F
Reset the unit
(P74 on 1)
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Disconnect the
power from
the ComfoAir.
Are the
connections
at the ComfoAir
correct?
Is the
resistance of
the NTC sensor
correct?
A0
Malfunction
Set P60 on "0".
Reset the unit
(P74 on 1)
A6
Malfunction
Set P51 on "0".
Reset the unit
(P74 on 1)
