Logitech MSZ-A09NA, OB450 REVISED EDITION-B service manual Instruction Of Troubleshooting

8-3. INSTRUCTION OF TROUBLESHOOTING

Start

Indoor unit oper- ates.

Outdoor unit doesn't operate.

Indoor unit operates. Outdoor unit doesn't operate normally.

Indoor unit doesn't receive the signal from remote controller.

OPERATION INDICATOR lamp on the indoor unit is flashing on and off.

Outdoor unit	Outdoor	Unit doesn't	Indoor unit	Indoor unit
operates only	unit doesn't	operate nor-	operates, when	doesn't operate,
in Test Run	operate even	mal operation	EMERGENCY	when EMER-
operation.	in Test Run	in COOL or	OPERATION	GENCY OPERA-
	operation.	HEAT mode.	switch is pressed.	TION switch is
				pressed.

If blinking of OPERATION INDI- CATOR lamp cannot be checked, it can be checked with failure mode recall function.

"Test Run operation" means the operation within 30 minutes after EMERGENCY OPERA- TION switch is pressed.

Check room temperature thermistor.

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

Refer to "How	Refer to	Refer to 8-6.
to check	"Check of R.V.	"Check of remote
inverter/com-	coil".	controller and
pressor".		receiver P.C.
		board".

1.Check indoor/out- door connecting wire. (Check if the power is supplied to the indoor unit.)

2.Refer to 8-6. "Check of indoor electronic control P.C. board and indoor fan motor".

Refer to outdoor unit service manual.

Left lamp	Left lamp	Left lamp	Left lamp	Left lamp	Left lamp	Left lamp	Left lamp
Flash on and	2-time flash	3-time flash	4-time flash	5-time flash	6-time flash	7-time flash	14-time flash
off at 0.5-sec-	Cause:	Cause:	Cause:	Cause:	Cause:	Cause:	Cause:
ond intervals	Indoor unit	Indoor unit	Indoor unit	Outdoor unit	Outdoor unit	Outdoor unit	Outdoor unit
Cause:	• Trouble	• Trouble of	• Trouble	• Outdoor	• Trouble of	• Trouble of	• Other ab-
Indoor/Outdoor	of room	indoor fan	of indoor	power	thermistor in	outdoor con-	normality
unit	temperature	motor	unit control	system	outdoor unit	trol system
• Miswiring or	/ indoor coil		system	abnormality
trouble of	thermistor
serial signal
						Replace the
Refer to 8-6.	Check room	Refer to 8-6.	Replace the	Refer to	Refer to		Check "Flow
"How to	temperature	"Check of	indoor elec-	"How to	"Check of	inverter P.C.	chart of the
check mis-	thermistor	indoor fan	tronic control	check	outdoor ther-	board or	detailed
wiring and	and indoor	motor".	P.C. board.	inverter/com-	mistors".	the outdoor	outdoor unit
serial signal	coil thermis-			pressor".		electronic	failure mode
error".	tor. Refer					control P.C.	recall func-
	to 8-7."Test					board.	tion."
	point diagram
	and voltage".

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