Troubleshooting Guide
- 87 -
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Only for training and service purposes
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10
Indoor unit BLDC fan motor
failure
Error
No.
Error Type Error Point Main Reasons
Indoor BLDC fan motor
feedback signal is absent
(for 50 sec.)
1. Motor connector connection fault
2. Indoor PCB fault
3. Motor fault
n Error diagnosis and countermeasure flow chart
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)
∞
∞
∞
∞
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