LG ATNH09GRLE2 Svc Manual page 72

6.6 Troubleshooting Indoor Error
CH 10 (Indoor unit BLDC fan motor failure)
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
1 4 5 6 7
<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)
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Only for training and service purposes
No
Connect properly
No
Replace indoor unit fan motor
Each termainl with the tester
Tester
+ -
1 4
5
4
6 4
7 4
Normal resistance(±10%)
TH chassis TD chassis
∞ ∞
k
hundreds kΩ hundreds kΩ
∞ ∞
hundreds kΩ hundreds kΩ
- 72 -
4. Trouble Shooting
LGE Internal Use Only