Mitsubishi Electronics MSY-A15NA, MSY-A24NA, MSY-A17NA Trouble criterion of main parts, MXZ type

OPERATION INDICATOR Lighted

Blinking

Not lighted

·Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates abnormality.

·OPERATION INDICATOR lamp (left-hand side lamp) is lighted.

No.	Abnormal	Operation indicator lamp	Symptom
	point
	MXZ type	Right lamp flash	Outdoor unit
1	Operation		operates but
			indoor unit
	mode
		2.5-second OFF	does not
	setting
			operate.

Condition

The operation mode of the each indoor

unit is differently set to COOL(includes DRY) and HEAT at the same time, the operation mode of the indoor unit that has operated at first has the priority.

Correspondence

•Unify the operation mode. Refer to outdoor unit service manual.

8-5. Trouble criterion of main parts

MSZ-A09NA MSZ-A17NA MSY-A15NA

MSZ-A12NA MSZ-A15NA MSZ-A24NA MSY-A17NA MSY-A24NA

Part name

Room temperature thermistor(RT11)

Indoor coil thermistor (RT12(MAIN), RT13(SUB))

Check method and criterion Figure

Measure the resistance with a tester.

Refer to 8-7. "Test point diagram and voltage",

"Indoor electronic control P.C. board", the chart of thermistor.

Indoor fan motor(MF)	Check 8-6. A.
Horizontal vane	Measure the resistance between the terminals with a tester.		RED
	(Part temperature 50° F ~ 86° F)		ROTOR
motor(MV)
			YLW
MSZ-A09/12/15/17NA	Color of the lead wire	Normal
			BRN
MSY-A15/17NA
	BRN-other one	235 " ~ 255 "
			ORN	GRN
Horizontal vane	Measure the resistance between the terminals with a tester.		RED
motor(MV1)
	(Part temperature 50° F ~ 86° F)		ROTOR
Vertical vane			YLW
motor(MV2)	Color of the lead wire	Normal
			BRN
MSZ-A24NA	BRN-other one	282 " ~ 306 "
MSY-A24NA			ORN	GRN

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