281
FDTN-H
52C secondary side
L
2
or
L
3
phase open?
Repair
YES
NO
Defective outdoor unit PCB
Replacement
(Defective CT circuit)
(1)
(2)
Outdoor unit
Red LED
Green LED
3 time flashes
Stays OFF
Is
L
3
phase at
primary side at open
phase
Correction
YES
NO
Defective outdoor unit PCB
Replacement
Outdoor unit
Red LED
Green LED
1 time flash
Stays OFF
NO
Power supply
checked at
L
1
-
L
2
,
L
1
-
L
3
or
L
2
-
L
3
phase of 52C
secondary side?
YES
YES
Compressor
overcurrent?
NO
Inspect at the unit side.
(1)
• Is the power supply voltage correct
(not too low)?
• Are the power supply wires appro-
priate (not too thin)?
• Is the overcurrent setting correct
(SW3 setting)?
• Is not it operated under overload?
Defective outdoor unit PCB
Replacement (Defective
CT input circuit)
• 3 Phase: Open phase at
L
1
or
L
2
phase
• Defective 52C
• 3 phase: Broken wire at
L
1
or
L
2
phase between 52C ~ CM or
TB
1
~ 52C
• During cooling: Is FM
0
operating?
• At heating:
Is FM
1
operating?
Is the service valve (gas side) opened
fully?
Is the filter clogged?
• Is it overcharged?
• Is the installation space of indoor
outdoor unit adequate?
• Is there any short circuit on the indoor/
outdoor unit?
2
Overcurrent of the compressor motor
Note (1) Measure and check the current value.
Confirm that the overcurrent setting by SW
3
of outdoor
unit PCB is correct.
Outdoor unit
Red LED
Green LED
2 time flashes
Stays OFF
3
The wiring (secondary wiring of 52C) to the compressor is open.
Notes (1) When voltage is detected at 52C primary side
L
2
or
L
3
phase but not at the secondary side, check also 52C (broken
coil, poor contact).
(2) When voltage is detected at 52C primary side
L
2
or
L
3
phase and there is no error at 52C (52C is energized if TB
1
L
2
or
L
3
terminal and 52C coil secondary side connector
are short circuited), the outdoor unit PCB (defective X
01
circuit or X
01
) or indoor unit PCB (defective thermostat
circuit) is defective.
(b) Inspection method when there are fault lamps (outdoor unit LED)
1
Open phase at L
3
phase (Primary side)
Summary of Contents for FDT208HEN-S
Page 74: ...MEMO...
