Zehnder Group ComfoAir 550 Luxe, Manual

Page: 35 / 48

3
For the installer - 31 - EN
A5 / A6
Malfunction of
bypass / pre-heater motor
Remove filters,
front and
metal cover
Activate self-test
(P81 op 1)
Is motor running? Yes No
Disconnect the power
and remove motor,
snap support and cog
Cog defective?
No
Replace
motor
Check connection to PCB:
12 VDC when motor running
(see P81 menu)
Voltage on PCB?? Yes Yes
Replace cog
No
Disconnect the power
and replace PCB
ATTENTION:
Reset unit!
Disconnect the power
and replace motor
ATTENTION!
Risk of electrocution:
do not touch the PCB,
the pre-heater
or the afterheater.
A0 / A11
Malfunction of
Temperature sensor
T
ge
/ T
AH
Check resistance
of temperature sensor:
Refer to table
Resistance
okay?
Yes No
Disconnect the power
and replace PCB
ATTENTION:
Reset unit!
Disconnect the power
and replace
temperature sensor
ATTENTION!
Risk of electrocution:
do not touch the PCB,
the pre-heater
or the afterheater.