Mitsubishi Electric PUZ-A18NHA6 Service Manual page 54

10-6. HOW TO CHECK THE PARTS
PUZ-A18/24/30/36/42NHA6
PUY-A12/18/24/30/36/42NHA6
Parts name
Thermistor (TH3)
Disconnect the connector then measure the resistance with a tester.
<Liquid>
(At the ambient temperature 50 to 86°F [10 to 30:])
Thermistor (TH6)
< 2-phase pipe>
Thermistor (TH7)
<Ambient>
Thermistor (TH8)
<Heat sink>
Thermistor (TH32)
<Comp. Surface>
Thermistor (TH33)
<Suction>
Fan motor (MF1,MF2) Refer to "10-6-8. Check method of DC fan motor (fan motor/ outdoor controller circuit board)".
Solenoid valve coil Measure the resistance between the terminals with a tester.
(At the ambient temperature 68°F [20:])
<4-way valve>
(21S4)
Motor for compressor Measure the resistance between the terminals with a tester.
(Winding temperature 68°F [20:])
(MC) U
V
W
Linear expansion valve
Disconnect the connector then measure the resistance with a tester.
(Winding temperature 68°F [20:])
(LEV-A)
For A12, 18
Red
M
1
Brown
2
Blue
3
Orange
4
Yellow
5
White 6
Linear expansion valve
Disconnect the connector then measure the resistance with a tester.
(LEV-A)
(Winding temperature 68°F [20:])
For A24–42
Gray
M
1
2
Orange
3
Red
4
Yellow
5
Black
6
Measure the resistance between the terminals with a tester.
Solenoid valve coil
(At the ambient temperature 68°F [20:])
<Bypass valve>
(SV)
For A24–36 only
PUZ-A18/24/30/36/42NHA6-BS
PUY-A12/18/24/30/36/42NHA6-BS
Normal
TH32 160 to 410 k"
TH3
TH6
4.3 to 9.6 k"
TH7
TH33
TH8 39 to 105 k"
A18–36
1500 i 150 "
Normal
A12, 18
A24, 30, 36
0.880 "
0.320 "
Red - White Red - Orange
Gray - Black Gray - Red
Normal
1450 i 150 "
Check points
Abnormal
Open or short
Normal
A42
2350 i 170 "
A42
0.266 "
Normal
Brown - Yellow Brown - Blue
46 i 4 "
Normal
Gray - Yellow
Gray - Orange
46 i 3 "
Abnormal
Open or short
Abnormal
Open or short
Abnormal
Open or short
Abnormal
Open or short
Abnormal
Open or short