DF M
ANUAL
E
RRORS
Manual version 3.0 (21-11-2017)
en-35
en
Fault rectification (for qualified technical staff only)
PROBLEM
POSSIBLE
CAUSE
RESOLUTION
The control panel works normally
but the unit does not respond.
The power supply to the fans is cut. 1. Check the fuses on the control
circuit board.
2. Check wiring between the con-
trol circuit board and the fans.
The connection between the con-
trol panel and the control circuit
board is not correct.
1. Check the control cable.
2. Check wiring between
Connectors
E
and
H
and the
unit’s control circuit board.
The contact on the external control
input is open.
1.
If no external control is con-
nected:
Check the bridge at the input.
2.
If an external control has
been connected (door con-
tact switch or BMS):
Check the operation of the con-
trol component.
3. Check wiring and connection of
control components to the
input.
4. Check wiring between the input
and the control circuit board
(INHIBIT connector).
The unit is not working and the
control panel LEDs are off.
The unit is not receiving power.
Check power supply connections,
wiring and fuses.
The connection between the con-
trol panel and the control circuit
board is not correct.
1. Check the control cable.
2. Check wiring between
Connectors
E
and
H
and the
unit’s control circuit board.
The control circuit board is not
working.
1. Check the control circuit board’s
fuse.
2. Check the power supply cable.
3. Replace the control circuit
board.
The control panel is defective.
Check the control panel by con-
necting another unit. Replace the
control panel if it is not working.
One fan does not work.
The fan is defective or not receiving
a power supply.
1. Check the wiring of the fan.
2. Replace the fan.
Fans are not working at a particular
speed level.
The connection at the particular fan
speed level is faulty.
Check the fans’ wiring.
