Haier AS12GB3HRA, Service Manual

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Service diagnosis
11 .4.3 Indoor DC fan motor malfunction
Indoor Display E14
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).
the a/c is electrifying, don’t pull out or insert the terminals of the motor, or else the motor would be
Damaged.
Domestic air conditioner
Method of
malfunction
detection
Malfunction
detection
conditions
Troubleshooting
The fan speed detected by the Hall IC during fan motor running which is used
to determine the fan motor operating
When there is no fan speed feedback signal within 2 minutes
Operation halt due to breaking of wire inside the fan motor
Fan motor overheat protection
Operation halt due to breaking of the fan motor lead wires
Detection error due to faulty indoor PCB
Supposed
causes
Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be caused
Motor power supply voltage
Unused
Unused
P.0V (reference potential)
Motor control voltage (15 VDC)
Rotation command voltage (1~6 VDC)
Rotation pulse input
38