121
M
M
Check of LEV
No
Yes
No
Yes
Start
Turn on power supply to the outdoor unit after checking LEV coil is mounted to the
LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Disconnect the connector
(CN771: unit A, CN772: unit B), and measure the
resistance of LEV coil to check the integrity.
Normal
Replace the outdoor electronic
control P. C. board
Replace the LEV coil.
N
N
Check of inverter/ compressor
No
Yes
Yes
No
Yes
No
Start
Disconnect the connector to the compressor at terminals. 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
connector leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Output voltage
COOL: 150V(58Hz), HEAT: 150V (58Hz)
Is voltage output?
W
1
Turn off power supply of indoor and outdoor unit,
and measure the compressor winding resistance
between the compressor terminals.
Is there resistance of 0.53
"
to 0.66
"
between
the each terminals?
Replace the outdoor electronic
control P. C. board
Return the lead wire of compressor to former, and
turn on power supply to indoor and outdoor unit.
Three minutes later, start EMERGENCY OPERATION.
Replace the
compressor.
W
1 • After the outdoor fan starts running, wait for 1 minutes or more before
measuring the voltage.
• The output voltage values in the above table have the tolerance of
i
20%.
• When cooling, heat exchanger of non-operating indoor unit frosts.
• When heating, non-operating indoor unit get warm.
• When heating, room does not get warm.
• When cooling, room does not get cool.
LED display:
LED1
LED2
Lighting
Lighting
6 time
Goes out
LED display:
LED1
LED2
Lighting
Lighting
Lighting
Twice
Twice
Goes out
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