Troubleshooting Guide
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Only for training and service purposes
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1. Fuse failure
2. Defective noise filter
40 Low current at CT 3. R phase connection problem
4. CT sensor failure (inverter PCB fail-
ure)ure)
Error
No.
Error Type Error Point Main Reasons
While inverter compressor
operation R phase current
drops below 2A
■ Error diagnosis and countermeasure flow chart
Is the fuse normal?
[refer electric component part]
No
Replace the fuse
Yes
Is noise filter normal?
[refer electric component part]
No
Replace noise filter
Yes
Replace Inverter PCB
After reset and restart the
system, is CT value (R phase
current) actually less
than 2A?*
Yes
No
Check connection state of
R phase cable and reconnect
* Measure the R phase current with clamp meter
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