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ADDITIONAL INFORMATION FOR CRITICAL PARTS:
Temperature sensor troubleshooting
Disconnect the temperature sensor from the PCB, and measure the resistance value with a multimeter.
Temperature sensors:
1.
Room temperature (T1) sensor,
2.
Indoor coil temperature (T2) sensor,
3.
Outdoor coil temperature (T3) sensor,
4.
Outdoor ambient temperature (T4) sensor,
5.
Compressor discharge temperature (T5) sensor
Compressor troubleshooting
Measure the resistance value of each winding by using the multi---meter.
A14490
Position
Resistance Value at 68
_
F (20
_
C)
Unit size:
9K and 12K
Unit size:
17 & 18K
Unit size:
22K
Blue --- Red
0.71
Ω
1.77
Ω
0.95
Ω
Blue --- Black
Red --- Blue
IPM continuity check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital multimeter to mea-
sure the resistance between P and UVWN; UVW and N.
Digital Tester
Normal
Resistance Value
Digital Tester
Normal
Resistance Value
(+)Red
(---)Black
∞
(M
Ω
)
(+)Red
(---)Black
∞
(M
Ω
)
P
N
U
N
U
V
V
W
W
(+)Red
Indoor Fan Motor
Measure the resistance value of each winding by using the multimeter.
A14484
Position
Resistance Value at 20
℃
(68
℉
)
9k &12K (115V)
Ω
±
8%
12K (208---230V)
Ω
±
8%
18K (208---230V)
Ω
±
8%
22K (208---230V)
Ω
±
8%
Black --- Red
75
381
183.6
112
118.5
White --- Black
150
267
206
82
78.5
