LG ACHH Series Manual page 73

Error
Error Type
No.
40
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 inverter PCB assembly normal?
Yes
Recheck power and installation condition
* Measuring input voltage
R(L1) S(L2) T(L3) N
Error Point
Micom input voltage isn't
within 2.5 V ±0.3 V at ini-
tial state of power supply
1. Check R/S/T wiring conditions
No
2. Check Noise filter wiring conditions
→ Rewire them if abnormality found.
Check R~S/S~T/T~R phase voltage 380-415 V ± 10 %,
R~N/S~N/T~N phase voltage 220 ± 10%
No
→ Check connection condition and wiring if power is
abnormal
No
Replace inverter PCB assembly
* Inverter PCB assembly
- 73 -
Main Reasons
1. Input voltage abnormal (R-S-T)
2. ODU inverter PCB damage
(CT sensing part)
Error code check