Trouble Shooting - Mitsubishi Electric City Multi PLFY-P06NLMU-E Technical & Service Manual

7

TROUBLE SHOOTING

7-1. Simple check of main components
Parts name
Room temperature
thermistor (TH21)
Liquid pipe thermistor
(TH22)
Gas pipe thermistor
(TH23)
Power transformer
Vane motor
Fan motor
Relay connector
Protector
White
1
P
Black
2
Blue
3
Red
4
Orange
5
Brown
7
Yellow
9
Linear expansion
CN60
valve
White
1
Yellow
2
Orange
3
LEV
Blue
4
Red
5
Brown
6
Drain-pump
Red
1
Red
3
Drain sensor
3
1
Disconnect the connector, then measure the resistance using a tester.
(Surrounding temperature 10°C to 30°C[50°F to 86°F])
Normal Abnormal
Open or short
4.3kΩ~9.6kΩ
Disconnect the connector and measure the resistance using a tester. (Surrounding temperature: 25°C[77°F])
Normal
CNT(1)~(3) App.112.5Ω (Model:06~18)
CN3T(1)~(3) App.1.2Ω
Measure the resistance between the terminals using a tester. (Surrounding temperature: 20°C to 30°C[68°F to 86°F])
1-2
1-3
Model:06~18
1-4
1-5
Measure the resistance between the terminals using a tester. (Surrounding temperature: 20°C[68°F])
White-Black
(1)-(2)
White-Blue
(1)-(3)
White-Red
(1)-(4)
White-Orange
(1)-(5)
White-Yellow
(1)-(9)
Disconnect the connector then measure the resistance valve using a tester.
(Surrounding temperature: 20°C[68°F])
(1)-(5) (2)-(6)
White-Red Yellow-Blown
Measure the resistance between the terminals using a tester.(Surrounding temperature: 20°C to 30°C[68°F to 86°F])
Normal
572Ω
(Model:06~18)
Measure the resistance between the terminals using a tester.
0˚C[32˚F]/6.0kΩ,10˚C[50˚F]/3.9kΩ
20˚C[68˚F]/2.6kΩ,25˚C[77˚F]/2.2kΩ
30˚C[86˚F]/1.8kΩ,40˚C[104˚F]/1.3kΩ
Check points
Open or short
(Model:06~18)
Normal
Open or short
App.300Ω
06 to 15 18
517.6Ω 369.6Ω
420.6Ω 310.1Ω
352.2Ω 268.9Ω
304Ω 229Ω
547Ω 431Ω
Normal
(3)-(5)
Orange-Red Blue-Brown
±10%
150Ω
Abnormal
Open or short
(Refer to the thermistor)
Abnormal
Abnormal
Abnormal
(4)-(6)
Open or
short
12