How To Check The Parts - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

8-6. HOW TO CHECK THE PARTS

Parts name
Thermistor (TH2) Disconnect the connector then measure the resistance with a multimeter.
<HIC Pipe> (At the ambient temperature 10 to 30°C)
Thermistor (TH3)
<Outdoor Liquid Pipe>
Thermistor (TH4)
<Compressor>
Thermistor (TH6)
<Suction Pipe>
Thermistor (TH7)
<Ambient>
Thermistor (TH8)
<Heat Sink>
Fan motor (MF1, MF2) Refer to the next page.
Solenoid valve coil Measure the resistance between the terminals with a multimeter.
<4-way valve> (At the ambient temperature 20°C)
(21S4)
Motor for compressor Measure the resistance between the terminals with a multimeter.
(MC) (Winding temperature 20°C)
U
V
W
Solenoid valve coil Measure the resistance between the terminals with a multimeter.
<Bypass valve> (SV1) (At the ambient temperature 20°C)
<Oil return valve> (SV3)
Linear expansion Valve
(LEV-A)
Gray
M 1
Orange
2
Red
3
Yellow
4
Black
5
Linear expansion Valve
(LEV-B)
Red
M
1
Blue
2
Orange
3
Yellow
4
White
5
OCH760
Normal
TH4 160 to 410 kΩ
TH2
TH3
4.3 to 9.6 kΩ
TH6
TH7
TH8 39 to 105 kΩ
Normal
1725 ± 172.5 Ω
Normal
0.237 ± 0.012 Ω
Normal
1182.5 ± 83 Ω
Gray - Black Gray - Red
46 ± 3 Ω
Red - White Red - Orange
46 ± 4 Ω
Checkpoints
Abnormal
Open or short
Abnormal
Open or short
Abnormal
Open or short
Abnormal
Open or short
Normal
Gray - Yellow Gray - Orange
Normal
Red - Yellow Red - Blue
97
Abnormal
Open or short
Abnormal
Open or short