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E
RRORS
PROBLEM
The control panel works normally
but the unit does not respond.
The unit is not working and the
control panel LEDs are off.
One fan does not work.
Fans are not working at a particular
speed level.
en-34
Fault rectification (for qualified technical staff only)
POSSIBLE CAUSE
The power supply to the fans is cut
off.
The connection between the con-
trol panel and the control circuit
board is not correct.
The contact on the external control
input is open.
The unit is not receiving power.
The connection between the con-
trol panel and the control circuit
board is not correct.
The control circuit board is not
working.
The control panel is faulty.
The fan is faulty or it is not receiv-
ing a power supply.
The connection at the particular fan
speed level is faulty.
C
A
OMFORT
IR
SOLUTION
1. Check the fuses on the control
circuit board.
2. Check wiring between the con-
trol circuit board and the fans.
1. Check the control cable.
2. Check wiring between
Connectors
and
and the
E
H
unit's control circuit board.
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).
Check power supply connections,
wiring and fuses.
1. Check the control cable.
2. Check wiring between
Connectors
and
and the
E
H
unit's control circuit board.
1. Check the control circuit board's
fuse.
2. Check the power supply cable.
3. Replace the control circuit
board.
Check the control panel by con-
necting another unit. Replace the
control panel if it is not working.
1. Check the wiring of the fan.
2. Replace the fan.
Check the fans' wiring.
C
URTAIN
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