Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting
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Only for training and service purposes
LGE Internal Use Only
10
Indoor BLDC Fan Motor
Lock
The Fan is not operated
properly
Check the Indoor fan locking
Display
code
Title Cause of error Check point & Normal condition
Check Point
Check the PCB during the Power on
1. Check the Voltage Red line to Black line
→ The Voltage is about [input voltage x 1.414]
→ if the Voltage does not come with the above Voltage,
→ Check the power input
→ Replace the PCB & Motor
2. Check the Voltage Black line to White
→ the Voltage is DC 15V
→ Check the Power input
→ Replace the motor
Check the Motor
1. Check the shaft
→ if the shaft is not turn smoothly, the Motor Power IC is defected
→ replace the motor
2. Check the motor resistance(if the shaft is turn smoothly, check the resistance)
→ Check Red line to Black line, Blue line to Black line
→ The resistance should infinite
→ replace the motor
Tester
Fan motor
connector
Yellow
Blue
White
Black
Red