EN - 20
A5 / A6
Malfunction in the bypass /
pre heater motor
Release the front panel
by unscrewing the screws.
Remove the plastic panel
in front of the control
circuit board
Activate the self-test.
(P76 on 1)
Lift the front panel
from its hinges.
Did the
bypass / pre heater motor
run
Yes
Disconnect the
power from
the ComfoAir.
Replace the
control circuit
board.
Remove the
motor
Disconnect the
power from
the ComfoAir.
Is the cog of
the motor
defective?
Yes
No
Replace the cog
of the motor
Replace the
motor
Was there
8 VDC power
present on the
motor?
Yes
Disconnect the
power from
the ComfoAir.
Replace the
motor
No
No
Risk of electrocution.