Specifications

DF MANUAL FAULTS
Manual version 2.0 (26-10-2012) en-33
en
Fault rectification (for qualified technical staff only)
P
ROBLEM POSSIBLE CAUSE RESOLUTION
The control panel works normally
but the unit does not respond.
The fans are dead. 1. Check the fuse on the control
PCB.
2. Check wiring between the con-
trol PCB and the fans.
The connection between the con-
trol panel and the printed circuit
board is not correct.
1. Check the control cable.
2. Check wiring between
Connectors
E and H and the
unit’s control PCB.
The contact on the external control
input is open.
If an external control has not
been connected:
Check the input bridge.
3. If an external control has been
connected (door contact switch
or BMS:
Check whether control compo-
nents are working properly.
4. Check wiring and connection of
control components to the
input.
5. Check wiring between the input
and the control PCB (INHIBIT
connector).
The unit is not working and the
control panel LEDs are off.
The unit is dead. Check power supply connections,
wiring and fuses.
The connection between the con-
trol panel and the printed circuit
board is not correct.
1. Check the control cable.
2. Check wiring between
Connectors
E and H and the
unit’s control PCB.
The control PCB is not working. 1. Check the control PCB’s fuse.
2. Check the power supply cable.
3. Replace the printed 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 dead or defective. 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.