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How to check inverter/ compressor
• When heating, room does not get warm.
• When cooling, room does not get cool.
LED display:
LED1
LED2
Lighting
Lighting
Lighting
Twice
Twice
Goes out
No
No
Yes
Yes
Yes
No
Yes
No
(MXZ-3A/4A)
Yes
(MXZ-2A)
Disconnect the terminal of the compressor.
3 minutes after turning on the power supply, start
EMERGENCY OPERATION.
Is output balanced?
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor rare short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
Measure the voltage between each
lead wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Output voltage
COOL: 150V(48Hz) HEAT: 170V(64Hz)
Is voltage output?
W
1,
W
2
Turn off power supply of indoor and outdoor unit,
and measure the compressor winding resistance
between the compressor terminals.
Is the resistance between each terminal normal?
Is the input voltage to the outdoor electronic
control P.C. board 370V or more?
Reconnect the lead wire of compressor, and turn on
power supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Replace the
compressor.
Replace the inverter P.C. board or
the power board.
W
1 • After the outdoor fan starts running, wait for 1 minutes
or more before measuring the voltage.
• The output voltage values have the tolerance of
i
20%.
W
2 • The output differs depending on the capacity or the
number of indoor units to be operated.
OB377--3.qxp 05.12.14 3:34 PM Page 67
