What To Do In The Event Of A Malfunction / Trouble Shooting - Zehnder ComfoAir 550 Installationsanleitung

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 /
Yes
Reset the unit
(P74 on 1)
Disconnect the
power from
the ComfoAir.
Replace the
control circuit
board
.
A2 / A3 / A4
NTC sensor
T1 / T2 / T3 / T4
is defective
Was the
temperatuur
No
ºC or
< -27
> 127ºC?
Remove the handles
from the ComfoAir.
Remove the filters from
the ComfoAir.
Release the front panel
by unscrewing the
screws.
Slide the front panel
upwards and remove
the front panel from
the ComfoAir.
Release the cover panel
by unscrewing the
screws.
Remove the cover
panel.
Remove the screw from
the electronics carriage
and pull the electronics
carriage carefully
forwards.
Are the
connections
Yes
at the ComfoAir
correct?
Is the
resistance of
No
the NTC sensor
correct?
Disconnect the
power from
the ComfoAir.
Replace the
NTC sensor.
Resistance tabel for
(NTC) temperature sensors:
Temperature
MIN.
No
Disconnect the
power from
the ComfoAir.
Reconnect the NTC
sensor.
Reconnect the
power to
the ComfoAir.
MID. MAX.
19 - EN