Trouble Criterion Of Main Parts; Defrost Thermistor; Compressor; R.v. Coil - Mitsubishi Electric MXZ-2A40VA Service Manual

13-5. Trouble criterion of main parts

MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA
Part name

Defrost thermistor

(RT61)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Gas pipe temperature
thermistor (RT6A~D)
Discharge temperature
thermistor (RT62)
Fin temperature
thermistor (RT64)

Compressor

W
RED
V
U
WHT
BLK
Outdoor fan motor
WHT
RED BLK
2 3
1
W
V
U
MXZ-2A MXZ-3A/4A

R.V. coil

Linear expansion valve
WHT
RED LEV
ORN
YLW BRN BLU
High pressure switch
(HPS)
MXZ-4A80
Measure the resistance with a tester.
Refer to 13-7. "Test point diagram and voltage",1. "Inverter P.C. board" or 2.
"Outdoor electronic control P.C. board", the chart of thermistor.
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 13-7. "Test point diagram and voltage",1. "Inverter P.C.board" or 2. "Outdoor
electronic control P.C. board", the chart of thermistor.
Measure the resistance between terminals using a tester.
(Winding temperature : -10°C ~ 40°C)
MXZ-2A40/52
0.56Ω ~ 0.69Ω
Measure the resistance between lead wires using a tester.
(Part temperature : -10°C ~ 40°C)
RED
(W)
U
Normal (1 Each phase)
WHT
V (V)
MXZ-2A
BLK
(U)
W
12Ω ~ 16Ω
Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C)
Normal
1.2kΩ ~ 1.56kΩ
Measure the resistance using a tester.(Part temperature : -10°C ~ 40°C)
Color of lead wire
WHT - RED
RED - ORN
YLW - BRN
BRN - BLU
HPS
Check method and criterion
Normal (1Each phase)
MXZ-3A54/4A71
0.39Ω ~ 0.49Ω
MXZ-3A/4A
13.4Ω ~ 16.4Ω
Normal
37.4Ω ~ 53.9Ω
Pressure
3.7 ± 0.15MPa
+
4.8 0.05 MPa
-
0.1
62
MXZ-4A80
1.29Ω ~ 1.49Ω
Normal
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