[
VII
Troubleshooting ]
- 11 -
HWE1209A
GB
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 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) Drain-up mechanism
Measure the resistance between the terminals with a tester.
(coil temperature 20°C)
Normal
Abnormal
4.3k - 9.6k
Open or short
(Refer to the thermistor characteristic graph below.)
Low-temperature thermistor
Room temperature thermistor (TH21)
Water inlet pipe thermistor (TH22)
Water outlet pipe thermistor (TH23)
Drain sensor (DS)
Thermistor R
0
= 15 k
3%
Multiplier of B = 3480 k
2%
0°C 15k
10°C 9.6k
20°C 6.3k
25°C 5.2k
30°C 4.3k
40°C 3.0k
(A) Temperature (°C)
(B) Resistance
(k )
Normal
Abnormal
340
Open or short
Rt = 15 exp { 3480(
) }
1
273+t
1
273
0
10
20
30
40
50
-20
-10
0
10
20
30
40
50
(A)
(B)
1
3
HWE1209A.book 11 ページ ２０１７年３月９日 木曜日 午後５時３７分
