Zehnder ComfoAir 550 Installationsanleitung Seite 93

Activate the self-test
Yes
Disconnect the power
from the ComfoAir.
Replace the fan.
the
(See maintenance
)
chapter of the fans
EN - 24
E1 /
Supply fan / Exhaust
fan not rotating
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
Remove the cover
Remove the small
plastic panel in front of
control circuit
the
board
the two screws.
there 230 VAC
Yes
power present
on the fan ?
(P76 on 1)
Is a
control signal
(1,5 - 10 VDC)
present on
the fan?
Disconnect the
power from
the ComfoAir.
Replace the
control circuit
board
E2
screws.
panel.
by unscrewing
Is
No
Disconnect the power
from the ComfoAir.
Replace the control
circuit board.
No
Risk of electrocution.