Trouble Shooting - Mitsubishi Electric PEFY-P15NMHU-E Technical & Service Manual

7

TROUBLE SHOOTING

7-1. How to check the parts
Parts name
Room temperature Disconnect the connector, then measure the resistance using a tester.
thermistor
(TH21) (Sorrounding temperature 10°C~30°C[50°F~86°F])
Liquid pipe thermistor
(TH22)
Gas pipe thermistor
(TH23)
Trans Disconnect the connector and measure the resistance using a tester.
CN3T CNT
3T
3
1
Fan motor PEFY-P15~54
Relay connector
Protector
Fan motor
PEFY-P72
Relay connector
Protector
Linear expansion
Disconnect the connector then measure the resistance valve using a tester.
valve
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
4
Red
5
Brown
6
Drain Pump Disconnect the connector then measure the resistance
valve using a tester.
(Drain water lift up kit)
(Sorrounding temperature 20°C~30°C[68°F~86°F])
Red
1
Red
3
Drain sensor Measure the resistance between the terminals using
(Drain water lift up kit) a tester.
3
1
13
Normal
Ω Ω
4.3k ~9.6k Open or short
Normal
CNT(1)-(3) App.15
CN3T(1)-(3) App.4
Measure the resistance between the terminals using a tester.
Motor terminal
or
Gray
1
Relay connector
2
Blue
3
Gray-Orange
Black
4
Orange
5
Gray-Black
Blown
6
7
Gray-Brown
Red
8
Red
9
Gray-Blue
·
96
Measure the resistance between the terminals using a tester.
Motor terminal
Brown
4
or
Relay connector
Red
1 Red-White
Orange
8
Orange
White-Black
9
Red-Black
White
2
Brown-Gray
Gray
5
Black
3 Gray-Yellow
Yellow
6
Brown-Yellow
Normal
(1)-(5) (2)-(6)
White-Red Yellow-Brown
150Ω
Normal
399Ω Open or short
(Refer to the thermistor characteristic graph)
0˚C/6.0kΩ, 10˚C/3.9kΩ
20˚C/2.6kΩ, 25˚C/2.2kΩ
30˚C/1.8kΩ, 40˚C/1.3kΩ
Check points
Abnormal
(Refer to the thermistor characteristic graph)
Abnormal
Ω
Open or short
Ω
Normal
P40· 50 P63
68.8Ω 47Ω 32.9Ω
53.73Ω 37.29Ω 27.56Ω
59.92Ω 39.81Ω 30.64Ω
74.17Ω 49.8Ω 38.31Ω
Normal Abnormal
6.68 Ω
6.68 Ω
6.68 Ω
Open or short
8.144Ω
8.144Ω
8.144Ω
(3)-(5) (4)-(6)
Orange-Red Blue-Brown
±10%
Abnormal
P71 P80 P100·125·140
33.3Ω 14.05Ω
27.1Ω 9.11Ω
28.56Ω 9.87Ω
36.82Ω 12.89Ω
Abnormal
Open or short
<Thermistor characteristic graph>
Room temperature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe temperature thermistor(TH23)
Drain sensor(DS)
=15kΩ ± 3%
Thermistor R
0
Fixed number of B=3480kΩ ± 2%
1
Rt=15exp { 3480(
273+t
0˚C 32˚F 15kΩ
50
10˚C 50˚F 9.6kΩ
20˚C 68˚F 6.3kΩ
25˚C 77˚F 5.2kΩ 40
30˚C 86˚F 4.3kΩ
40˚C 104˚F 3.0kΩ
30
20
10
0
-20 -10 0 10 20 30 40 50
-4 14 32 50 68 86 104 122
(at 20˚C[68°F])
Abnormal
Open or short
(at 20˚C[68°F])
1
) }
273
(˚C)
[˚F]
Temperature