Biddle DF Series Manual page 36

en
F
AULTS
Fault rectification (for qualified technical staff only)
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.
en-36
POSSIBLE CAUSE
The power supply to the fans is cut.
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 defective.
The fan is defective or not receiving
a power supply.
C A
OMFORT IR
RESOLUTION
1. Check the fuses on the control
circuit board.
2. For water-heated units and for
units at ambient temperature,
check the extra fuses in the unit.
3. 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. For water-heated units and for
units at ambient temperature,
check the extra fuses in the unit.
3. Check the power supply cable.
4. 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.
C
URTAIN