71
[SUZ-KA25/35VA(H).TH]
Check of open phase
B
Check of intelligent power module
C
How to check inverter/compressor
A
Check the voltage
between terminals.
Check the
compressor.
Disconnect the connector (CN61)
between compressor and the intelligent
power module (IPM).
Check the resistance of the intelligent
power module.
See D “Check of compressor”.
No
See B “Check of open phase”.
See C 'Check of intelligent power module'.
Is the resistance
infinite?
Yes
Replace the inverter P.C.
board.
No
(0~several
")
Yes
Are the voltages
balanced?
Replace the inverter P.C.
board and compressor.
●With the connector between compressor and the intelligent power
module disconnected, activate the inverter and check if the inverter
is normal by measuring the balance of voltage between terminals.
<< Operation method>>
Start cooling or heating operation by pressing the EMERGENCY OPERATION switch
on the indoor unit. (test-run mode : refer to page 31 for SLZ/SUZ and 37 for SEZ/SUZ.)
<<Measurement point>> + Measure AC voltage between the lead wires at 3 points.
BLK (U)-WHT (V)
BLK (U)-RED (W)
WHT(V)-RED (W)
NOTE 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of inverter P.C. board flashes 9 times.
●Measure the resistance between terminals on the intelligent
power module.
<<Measurement point>>
at 6 points
BLK-WHT, WHT-BLK
BLK-RED, RED-BLK
WHT-RED, RED-WHT
<<Judgement>>
Infinite []···········Normal
0~dozens of ······Abnormal (short)
Output voltage [V]
115V
ohmmeter indication
Normal
(infinite)
Abnormal
(0~dozens of )
X1
X1
LED
Inverter P.C. board
9-time flash
2.5-second OFF
Flashing
12-5. Troubleshooting flow
Outdoor unit does not operate.
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