17 - 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.
Disconnect the
power from
the ComfoAir.
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 small
plastic panel in front
of the control circuit
board by unscrewing
the two screws.
Remove the cover
panel.
Are the
connections
at the
NTC sensor
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 unit
(P74 on 1)
Set P51 on "0"
A6
Malfunction
Yes
No
Was the
temperature
< -27ºC or
> 127ºC?
Reset the malfunction
(P74 on 1)
A1 /
A2 / A3 / A4
NTC sensor
T1 / T2 / T3 / T4
is defective
Release the front panel
by unscrewing the
screws.
Reset the unit
(P74 on 1)
Check the resistance
of the malfunctioning
temperature sensor according
to the adjacent table
Pull the connector
of the malfunctioning
temperature sensor
from the PCB
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:
Summary of Contents for ComfoAir 350 Basic Series
Page 1: ...Cooling Fresh Air Clean Air Heating ComfoAir 350 Basic Installer manual...
Page 4: ...EN IV...
Page 30: ...EN 26...
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