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[ VII Troubleshooting ]
VII Troubleshooting
[1] Troubleshooting
1. Check methods
1. Component and check points
(1) Thermistor
Room temperature thermistor (TH21)
Water inlet thermistor (TH22)
Water outlet thermistor (TH23)
Disconnect the connector and measure the resistance between terminals with a volt meter.
(Ambient temperature 10°C - 30°C)
Normal
4.3kΩ - 9.6kΩ
(Refer to the thermistor characteristic graph below.)
1) Thermistor characteristic graph
Low-temperature thermistor
Room temperature thermistor (TH21)
Water inlet pipe thermistor (TH22)
Water outlet thermistor (TH23)
Drain sensor (DS)
Thermistor R
= 15 kΩ 3%
0
Multiplier of B = 3480 kΩ 2%
Rt = 15 exp { 3480(
0°C 15kΩ
10°C 9.6kΩ
20°C 6.3kΩ
25°C 5.2kΩ
30°C 4.3kΩ
40°C 3.0kΩ
(A) Temperature
(B) Resistance
(2) Fan motor (CNMF)
Refer to the page on "DC fan motor (fan motor/indoor control board)."
(3) Flow control valve
Disconnect the connector, and measure the resistance between terminals with a tester.
Refer to the next page for details.
CN8A
(H)
1
(G)
2
(F)
3
(E)
4
M
(D)
5
(C)
6
(B)
FCV
7
(A)
8
(A)
Yellow
(B)
White
(C) Black
(D) Brown
HWE18200
Abnormal
Open or short
1
1
) }
273+t
273
(°C)
(kΩ)
1-5
2-5
Purple-Brown
Orange-Brown
(E)
Green
(F)
Blue
(G)
Orange
(H)
Purple
50
40
30
20
10
0
-20
-10
0
10
(A)
Normal
3-5
Blue-Brown
55Ω / PHASE
- 24 -
20
30
40
50
Abnormal
4-5
Open or short
Green-Brown
GB
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