Haier AS18ND1HRA-WHITE Service Manual page 98

11.4.3 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
when the detected rotation feedback singal don't receiced in 2 minutes
Malfunction
Decision
Conditions
■ Operation halt due to breaking of wire inside the fan motor .
Supposed
Causes ■ Fan motor overheat protection
■ Operation halt due to breaking of the fan motor lead wires
■ Detection error due to faulty indoor unit PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
How to check Fan Motor (DC)
Notes: the a/c is electrifying, don't pull out or insert the terminals of the
motor, else the motor would be damaged.
else parts damage may be occurred.
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).
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Seivice diagnosis
or
Domestic air conditioner