LG UU70W U34 - Page 44

Part 4 Trouble Shooting
- 44 -
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Is connector
connection proper?
Yes
No
Connect properly
Is fan motor
normal?*
Replace indoor unit fan motor
* It is normal when check hall sensor of indoor fan motor as shown below
Yes
No
k
Replace indoor unit PCB **
<Checking connection state of fan motor connector>
1 4 5
6 7
1
5
6
7
4
4
4
4
Each termainl with the tester
Tester
TH chassis
hundreds kΩ hundreds kΩ
hundreds kΩ hundreds kΩ
+-
TD chassis
Normal resistance(±10%)
** 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)
∞
∞
∞
∞
6.5 Troubleshooting Indoor Error
CH 10 (Indoor unit BLDC fan motor failure)