Mitsubishi Electronics Trouble Criterion of Main Parts MUZ-FD09NAMUZ-FD12NA, Blk Wht Wht Red

10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-FD09NAMUZ-FD12NA

Part name		Check method and criterion					Figure
Defrost thermistor
(RT61)
Ambient temperature	Measure the resistance with a tester.
thermistor (RT65)	Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
Outdoor heat ex-	board”, the chart of thermistor.
changer temperature
thermistor (RT68)
Discharge tem-	Measure the resistance with a tester. Before measurement, hold the
perature thermistor
	thermistor with your hands to warm it up.
(RT62)
Fin temperature	Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
	board”, the chart of thermistor.
thermistor (RT64)
	Measure the resistance between terminals using a tester.			WHT		RED BLK
	(Winding temperature : -4 ~ 104°F (-20 ~ 40°C))
					2		3			1
									W
Compressor		Normal
		U-V
		U-W	1.52 ~ 2.17 Ω		V				U
		V-W
	Measure the resistance between lead wires using a tester.			WHT		RED BLK
	(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
					2		3			1
Outdoor fan motor		Color of lead wire	Normal
								W
		RED – BLK	11 ~ 16 Ω
		BLK – WHT			V			U
		WHT – RED
	Measure the resistance using a tester.
	(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
R. V. coil (21S4)
		Normal
		970 ~ 1380 Ω
	Measure the resistance using a tester.			WHT
	(Part temperature : 14 ~ 104°F (-10 ~ 40°C))							LEV
				RED
Expansion valve coil		Color of lead wire	Normal	ORN
		WHT – RED
(LEV)
		RED – ORN	37 ~ 54 Ω			YLW BRN					BLU
		YLW – BRN
		BRN – BLU

22