Westinghouse WHU09DHA21S, Service Manual, Page: 27 / 97

Notes
1)
Don’t put a compressor on its side or turn over.
2)
Please assemble the compressor in your air conditioner rapidly after removing the plugs.
Don’t place the comp. in air for a long time.
Avoid compressor running in reverse caused by connecting electrical wire incorrectly.
4)
In case AC voltage is impressed to compressor the compressor performance will
decrease because of its rotor magnetic force decreasing.
4. Inductance
Familiar error:
1)Sound abnormality
2)Insulation resistance disqualification
5. Step motor
5
3
4 2
1
Test in resistance.
TOOL: Multimeter.
Test the resistance of winding. The stepper motor fails if the resistance of winding is 0
(short circuit) or
∞ （
open circuit
）
.
6. Fuse
Check for continuity of fuse on PCB ASS’Y.
Remove the PCB ASS’Y from the electrical component box. Then pull out the fuse from the
PCB ASS’Y.Check for continuity by a multimeter as shown below.
Fuse
Fuse
6