LG MULTI V M ARNU07GTU 4 Series Svc Manual page 70

Troubleshooting Guide
Error
Error Type
No.
Inverter compressor CT
401
sensor error
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is Inv. PCB assembly normal?
Yes
Recheck power and installation condition
* Measuring input voltage
Error Point
Micom input voltage isn't
within 2.5V ±0.3V at initial
state of power supply
1. Check R/S/T/N wiring conditions
No
2. Check Noise filter wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T/T~R phase voltage is 380V±10%
No
R~N/S~N/T~N phase voltage is 220V±10%
→ Check connection condition and wiring if power is
abnormal
No
Replace Inv. PCB assembly
* Inv. PCB assembly
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Main Reasons
1. Input voltage abnormal (T-N)
2. ODU Inv. PCB damage
(CT sensing part)
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