Indoor Fan Motor Malfunction - Haier HSU09VHJ Service Manual

7. .2

Indoor fan motor malfunction

The rotation speed detected by the Hall IC during fan motor operation is used to determine
abnormal fan motor operation
when the detected rotation feedback singal don't receiced in 2 minutes
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
Turn off power supply and
rotate fan by hand
HSU09VHJ DB -SM
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
Be sure to turn off power switch before connect or disconnect connector,
else parts damage may be occurred.
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Service Diagnosis
Domestic Air Conditioner
or