Haier HSU09VHJ - 7.3.13 Fan Motor(DC Motor) or Related Abnormality

HSU09VHJ˄DB˅-SM Service Diagnosis
Domestic Air Conditioner
64
7.3.13Fan Motor(DC Motor) or Related Abnormality
Indoor Display LED1 flash 9 times
Method of The rotation speed detected by the Hall IC during fan motor operation is used to
determine
Malfunction
abnormal fan motor operation
Detection
Malfunction when the detected rotation feedback singal don’t receiced in 2 minutes
Decision
Conditions
Supposed
Ƶ
Operation halt due to short circuit inside the fan motor winding.
Causes
Ƶ
Operation halt due to breaking of wire inside the fan motor .
Ƶ
Operation halt due to breaking of the fan motor lead wires
Ƶ
Dedection error due to faulty indoor unit PCB
How to check Fan Motor (DC)
1. Check connector connection.
2. Check motor power supply voltage output (pins 4-7).
3. Check motor control voltage (pins 4-3).
4. Check rotation command voltage output (pins 4-1).
5. Check rotation pulse input (pins 4-2).
Notes:the a/c is electrifying,don’t pull out or insert the terminals of
the motor,else the motor would be damaged
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.