Logitech OB450 REVISED EDITION-B Troubleshooting Check Table, MSZ-A09/12, MSY-A15/17

8-4. TROUBLESHOOTING CHECK TABLE

Before taking measures, make sure that the symptom reappears for accurate troubleshooting.

When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.

OPERATION INDICATOR Lighted

Blinking

		Not lighted
No.	Abnormal	Operation indicator lamp	Symptom	Condition	Correspondence
	point
		Left lamp flashes.
	Miswiring	0.5-second ON			• Refer to 8-6.	"How to check
				The serial signal from the outdoor unit is not
1	or serial				miswiring and serial signal er-
				received for 6 minutes.
	signal	0.5-second OFF			ror".
	Indoor coil	Left lamp flashes.
		2-time flash			• Refer to 8-7. the characteristics
	thermistor
				The indoor coil or the room temperature ther-
2					of indoor coil thermistor, and
	Room tem-			mistor is short or open circuit.	the room temperature thermis-
	perature	2.5-second OFF			tor.
	thermistor
		Left lamp flashes.
		3-time flash
3	Indoor fan			The rotational frequency feedback signal is	• Refer to 8-6.	"Check of in-
	motor			not emitted during the indoor fan operation.	door fan motor".
		2.5-second OFF
		Left lamp flashes.
		4-time flash		It cannot properly read data in the nonvolatile
4	Indoor con-				• Replace the indoor electronic
				memory of the indoor electronic control P.C.
	trol system				control P.C. board.
		2.5-second OFF		board.
			Indoor unit and
		Left lamp flashes.	outdoor unit do
			not operate.		• Refer to "How to check of in-
		5-time flash		It consecutively occurs 3 times that the com-
	Outdoor				verter/compressor".
				pressor stops for overcurrent protection or
5	power sys-				Refer to outdoor unit service
				start-up failure protection within 1 minute after
	tem				manual
		2.5-second OFF		start-up.
					• Check the stop valve.
		Left lamp flashes.
	Outdoor	6-time flash		The outdoor thermistors short or open circuit	• Refer to "Check of outdoor
6					thermistor".
	thermistors			during the compressor operation.	Refer to outdoor unit service
		2.5-second OFF			manual.
		Left lamp flashes.			• Replace the inverter P.C. board
	Outdoor	7-time flash		It cannot properly read data in the nonvolatile
7					or the outdoor electronic con-
	control sys-			memory of the inverter P.C. board or the out-	trol P.C. board.
	tem	2.5-second OFF		door electronic control P.C. board.	Refer to outdoor unit service
					manual.
		Left lamp flashes.
	Other ab-	14-time flash		An abnormality other than above mentioned	• Check the stop valve.
8					• Confirm the abnormality in
	normality			is detected.	detail using the failure mode
		2.5-second OFF			recall function for outdoor unit.
	Outdoor
	control		Outdoor unit	It cannot properly read data in the nonvolatile	• Check the blinking pattern of
	system
					the LED on the inverter P.C.
9	MSZ-A09/12	Left lamp lights up	does not oper- memory of the inverter P.C. board or the out-
					board or the outdoor electronic
	/15/17		ate	door electronic control P.C. board.	control P.C. board.
	MSY-A15/17

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