52
Check of open phase
B
Check of power transistor module
C
How to check inverter/ compressor
A
(Only SLZ-A09AR.TH, SLZ-A12AR.TH) When OPERATION INDICATOR lamp flashes 5-time.
(Only SEZ-A09CR.W, SEZ-A12AR.TH) Error code “4210” displays on remote controller.
Outdoor unit does not operate.
Check the voltage
between terminals.
Check the
compressor.
Disconnect the connector (CN61)
between compressor and power
transistor module (IPM).
Check the resistance of power transistor
module.
See
D
“Check of compressor” on page 53.
No
See
B
“Check of open phase” on page 52.
See
C
'Check of power transistor module' on page 52.
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 power transistor
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 20 for SLZ/SUZ and 24 for SEZ/SUZ.)
<<Measurement point>>
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.
●
Disconnect the connector (CN61) between compressor and
power transistor module, and measure the resistance between
terminals on the power transistor 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
w
Measure AC voltage between
the lead wires at 3 points.
w
Measure the resistance between
the lead wires at 3 points
ohmmeter indication
Normal
(infinite)
Abnormal
(0~dozens of
"
)
X1
"
X1
"
LED
Inverter P.C. board
9-time flash
2.5-second OFF
Flashing
[SUZ-A09VR.TH SUZ-A12VR.TH]
OC304A --2qxp 04.6.29 8:34 AM Page 52
