Indoor unit failure mode table | Logitech OB450 REVISED EDITION-B

2. Indoor unit failure mode table

Left lamp of OPERATION	Abnormal point	Condition		Correspondence
INDICATOR lamp	(Failure mode)	Condition		Correspondence
INDICATOR lamp	(Failure mode)
Not lighted	Normal	—		—
1-time ﬂash every	Room temperature	The room temperature thermistor short or	Refer to the characteristics of the room temperature
1-time ﬂash every	Room temperature	open circuit is detected every 8 seconds dur-	Refer to the characteristics of the room temperature
0.5-second	thermistor	ing operation.	thermistor (8-7.).
		ing operation.
2-time ﬂash	Indoor coil	The indoor coil thermistor short or open circuit	Refer to the characteristics of the main indoor coil ther-
2.5-second OFF	thermistor	is detected every 8 seconds during operation.	mistor, the sub indoor coil thermistor (8-7.).
3-time ﬂash	Serial signal	The serial signal from outdoor unit is not re-	Refer to 8-6.	"How to check miswiring and serial
2.5-second OFF	Serial signal	ceived for a maximum of 6 minutes.	signal error".
2.5-second OFF		ceived for a maximum of 6 minutes.	signal error".
11-time ﬂash		The rotational frequency feedback signal is
11-time ﬂash	Indoor fan motor	not emit during the 12 seconds the indoor fan	Refer to 8-6.	"Check of indoor fan motor".
2.5-second OFF	Indoor fan motor	not emit during the 12 seconds the indoor fan	Refer to 8-6.	"Check of indoor fan motor".
2.5-second OFF		operation.
		operation.
12-time ﬂash	Indoor control	It cannot properly read data in the nonvolatile
12-time ﬂash	Indoor control	memory of the indoor electronic control P.C.	Replace the indoor electronic control P.C. board.
2.5-second OFF	system	memory of the indoor electronic control P.C.	Replace the indoor electronic control P.C. board.
2.5-second OFF	system	board.
		board.

NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (8-4.).

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