Mitsubishi Electric MUZ-GB50VA, Service Manual

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11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-GB50VA
Part name Check method and criterion Figure
Defrost thermistor (RT61)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger tem-
perature thermistor
(RT68)
Measure the resistance with a tester.
Refer to 11-6. "Test point diagram and voltage", 1. "Outdoor electronic con-
trol P.C. board” or 4. "Inverter P.C. board", for the chart of thermistor.
Discharge temperature
thermistor
(RT62)
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 11-6. "Test point diagram and voltage", 1. "Outdoor electronic con-
trol P.C. board" or 4. "Inverter P.C. board", for the chart of thermistor.
Fin temperature
thermistor (RT64)
Compressor
Measure the resistance between terminals using a tester.
(Winding temperature : -10 ~ 40°C)
Normal
E1 E2 E3
0.40 ~ 0.49 Ω 0.86 ~ 1.06 Ω
Outdoor fan motor
Measure the resistance between lead wires using a tester.
(Part temperature : -10 ~ 40°C)
Color of lead wire Normal
RED – BLK
13.4 ~ 16.4 Ω BLK – WHT
WHT – RED
R. V. coil
Measure the resistance using a tester.
(Part temperature : -10 ~ 40°C)
Normal
E1 E2 E3
2.6 ~ 3.3 k Ω 0 1.32 ~ 1.62 Ω
Linear expansion valve
Measure the resistance using a tester.
(Part temperature : -10 ~ 40°C)
Color of lead wire Normal
WHT – RED
37.4 ~ 53.9 Ω
RED – ORN
YLW – BRN
BRN – BLU
W
U
V
WHT
RED
BLK
LEV
WHT
RED
YLW BRN
ORN
BLU
U
RED
WHT
BLK
V
W
(W)
(V)
(U)