Troubleshooting; Check Methods - Mitsubishi Electric CITY MULTI PEFY-WP40VMA-E Technical & Service Manual

[ 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) Drain-up mechanism
Measure the resistance between the terminals with a tester.
(coil temperature 20°C)
1
3
HWE1114B
Abnormal
Open or short
1 1
) }
273+t
273
(°C)
(kΩ)
Normal
340 Ω
50
40
30
20
10
0
-20 -10 0 10 20
(A)
Abnormal
Open or short
- 17 -
30 40 50
GB