[ VII Troubleshooting ]
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HWE1804A GB
VII Troubleshooting
[1] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
Inlet air temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Outdoor air temperature thermistor (TH24)
Disconnect the connector and measure the resistance between terminals with a tester.
(Ambient temperature 10°C - 30°C)
1) Thermistor characteristic graph
(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 next page for details.
Normal Abnormal
4.3kΩ - 9.6kΩ Open or short
(Refer to the thermistor characteristic graph below.)
Thermistor R
0
= 15 kΩ 3%
Multiplier of B = 3480 kΩ 2%
0°C 15kΩ
10°C 9.6kΩ
20°C 6.3kΩ
25°C 5.2kΩ
30°C 4.3kΩ
40°C 3.0kΩ
Normal Abnormal
1-6 2-6 3-6 4-6 Open or short
White-Red Yellow-Red Orange-Red Blue-Red
(150Ω) 10%
(A) Red (E) Yellow
(C) Blue (F) White
(D) Orange
Rt = 15 exp { 3480( ) }
1
273+t
1
273
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
Temperature(°C)
Resistance(kΩ)
1
2
3
4
6
LEV
M
(A)
(C)
(D)
(E)
(F)
CN60
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