LG MULTI V M ARNU07GTU 4 Series Svc Manual page 58

Troubleshooting Guide
Error
Error Type
No.
Indoor unit BLDC fan motor
failure
10
n Error diagnosis and countermeasure flow chart
Is connector
connection proper?
Yes
Is fan motor
normal?*
Yes
Replace indoor unit PCB **
* It is normal when check hall sensor of indoor fan motor as shown below
4 5 6 7
1
<Checking connection state of fan motor connector>
** Replace the indoor unit PCB, and then make sure to do Auto addressing and input the
address of central control
(Notice: The connection of motor connector to PCB should be done under no power
supplying to PCB)
Indoor BLDC fan motor
feedback signal is absent
(for 50 s)
No
Connect properly
No
Replace indoor unit fan motor
Each termainl with the tester
Tester
+ -
1 4
5
4
6 4
7 4
Error Point
1. Motor connector connection fault
2. Indoor PCB fault
3. Motor fault
Normal resistance(±10%)
Chassis
∞ ∞
hundreds kΩ hundreds kΩ k
∞ ∞
hundreds kΩ hundreds kΩ
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Main Reasons