22
OCH688A
10-5. TROUBLESHOOTING FLOW
Are the voltages balanced?
Disconnect the connector (CN61) between
compressor and the intelligent power module
(IPM).
Replace the inverter P.C. board.
Check the voltage between terminals.
Check the compressor.
See 10-5. “Check of compressor”.
No
Yes
See 10-5. “Check of open phase”.
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the inverter is normal by measuring the voltage balance between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<Operation method (Test run operation)>
1. Press the TEST (RUN) button twice.
2. Press the MODE button and switch to the COOL (or HEAT) mode.
3. Compressor starts at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. To cancel test run operation, press the ON/OFF button on remote controller.
<Measurement point>
at 3 points
BK (U) - WH (V)
BK (U) - RD (W)
WH(V) - RD (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 the inverter P.C. board blinks 9 times.
(
Refer to "10-6. TEST POINT DIAGRAM AND VOLTAGE".)
Measure AC voltage between the lead wires at 3 points.
Refer to 10-5. “Check of compressor
operation time”.
Does the compressor operate continuously?
Refer to 10-5. “Check of compressor start failure”.
OK.
No
Yes
Refer to 10-5. “Check of compressor
winding”.
Is the compressor normal?
Replace the compressor.
No
Yes
B Check of open phase
A How to check inverter/compressor
C Check of compressor
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