Haier HSU24VHG(DB)-G&W, Service Manual

Page: 52 / 98

Service Diagnosis
51
Domestic Air Conditioner
7.3.2 Indoor fan motor malfunction
Indoor Display E14
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 signal don’t received in 2 minutes
Decision
Conditions
Supposed Causes
Operation halt due to breaking of wire inside the fan motor.
Operation halt due to breaking of the fan motor lead wires.
Detection 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 1-4).
3. Check motor control voltage (pins 4-5).
4. Check rotation command voltage output (pins 4-6).
5. Check rotation pulse input (pins 4-7).
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
else parts damage may be occurred.