LG AMNW07GDBL1 Service Manual page 93

Part 5. Trouble Shooting
Display
Title
code
C/T
40
Sensor Error
WARNING
Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state
of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
■ Error Diagnosis and Countermeasure Flow Chart ■ Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal ?
Yes
Is Inverter PCB Normal?
Yes
Recheck power and
installation condition
Check Point
1. Check the Input Voltage (L–N ➔ 230V±10%)
2. Check Input Voltage Sensor output voltage (2.5Vdc±10%)
< Input Power Source Check Point >
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Cause of error
• Initial current error
No
Check L~N Voltage is 230V±15%
No
Replace inverter PCB assembly
- 92 -
Check point & Normal condition
• Malfunction of current detection circuit.
(Open / Short)
• Check CT Sensor output voltage :
2.5Vdc ±5%
LGE Internal Use Only