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[ VIII Troubleshooting ]
VIII Troubleshooting
[1] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Disconnect the connector and measure the resistance between terminals with a tester.
(Ambient temperature 10°C - 30°C[50°F-86°F])
Normal
4.3kΩ - 9.6kΩ
(Refer to the thermistor characteristic graph below.)
1) Thermistor characteristic graph
Low-temperature thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Drain sensor (DS)
Thermistor R
= 15 kΩ±3%
0
Multiplier of B = 3480 kΩ±2%
Rt = 15 exp { 3480(
273+t
0°C
32°F 15kΩ
10°C
50°F 9.6kΩ
20°C
68°F 6.3kΩ
25°C
77°F 5.2kΩ
30°C
86°F 4.3kΩ
40°C 104°F 3.0kΩ
(A) Temperature
(B) Resistance
(2) Fan motor (CNMF)
Refer to the page on "DC fan motor (fan motor/indoor control board)."
(3) Linear expansion valve
Disconnect the connector, and measure the resistance between terminals with a tester.
Refer to the following.
CN60
(F)
1
(E)
2
(D)
3
M
(C)
4
(B)
5
LEV
(A)
6
(A)
Brown
(B)
Red
(C)
Blue
HWE1833B
Abnormal
Open or short
1
1
) }
273
(°C)[°F]
(kΩ)
Normal
1-5
2-6
White-Red
Yellow-Brown
200 kΩ±10%
(D)
Orange
(E)
Yellow
(F)
White
50
40
30
20
10
0
-20
-10
0
10
20
30
-4
14
32
50
68
86
(A)
3-5
4-6
Orange-Red
Blue-Brown
- 20 -
40
50
104 122
Abnormal
Open or short
GB
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