5. TROUBLESHOOTING
(1) Check before and after troubleshooting
Many problems may occur because of wiring or power supply problems, and so you should check these areas
first. Problems here can cause incorrect results in some of the other tests, and so they should be remedied
first.
1. Check power supply wiring
(a) Single-phase
Check that the power supply wires are correctly connected to terminal No. 1 through No. 4 on the
4P terminal plate on the indoor unit and L and N on the 6P terminal on the outdoor unit.
(b) 3-phase
Check that the power supply wires are correctly connected to terminal No.1 through No. 4 on the
4P terminal plate on the indoor unit and L1 through L3 and N on the 8P terminal on the outdoor
unit.
2. Check the inter-unit wiring
Check that the inter-unit control wires (AC 220 - 240 V Line voltage) are correctly connected
between the indoor unit and outdoor unit.
3. Check the power supply
Check that the voltage is within the specified range ( ±10% of the rating).
Check that power is supplied.
WARNING
If the following troubleshooting must be done with the power being supplied, take care not to touch
any uninsulated live parts that will given an ELECTRIC SHOCK.
4. Check the lead wires and connectors in indoor and outdoor units.
Check that the sheaths of the lead wires are not damaged.
Check that the lead wires are firmly connected to the terminal plate.
Check that the wiring has been performed correctly.
5. Reference
• Condition of general cooling operation (Thermo. ON)
SWEEP..................ON
Indoor fan speed....HIGH
Single-phase outdoor unit
3-phase outdoor unit
1
2
4
1
2
4
L
N
Indoor Unit
Outdoor Unit
Ground
Ground
B
A
0611_X_S
L
N
Power supply
Inter-Unit
Wiring
(Line voltage)
1
2
4
1
2
4
L1
N
Indoor Unit
Outdoor Unit
Power supply
Inter-Unit
Wiring
(Line voltage)
Ground
Ground
B
A
L1
L2
L2
L3
L3
N
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