Haier 1U18FS2ERA Service Manual page 70

8.4.3 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
Malfunction when the detected rotation feedback singal don't receiced in 2 minutes
Decision
Conditions
Supposed Operation halt due to breaking of wire inside the fan motor .
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)
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.
else parts damage may be occurred.
68
Service Diagnosis
or
Domestic Air Conditioner