Mitsubishi Electronics MUZ-GB50VA service manual Time flash Communication error Lighting

MUZ-GB50VA

The left lamp of	Abnormal point	LED indication		Condition	Correspondence	Indoor/outdoor
OPERATION INDICATOR		(Outdoor P.C. board)				unit failure mode
	(Failure mode / protection)
lamp (Indoor unit)		LED 1	LED 2			recall function
11-time flash	Communication error	Lighting	6 times	Communication error occurs	• Check the connecting
	between P.C. boards			between the electronic control P.C.
					wire between outdoor
				board and power board for more
					electronic control
				than 10 seconds.
					P.C. board and power
				When the communication between
					board.
				boards protection stop is
				continuously performed twice.
	Current sensor	Lighting	7 times	When a short or open circuit is	• Replace the power
				detected in the current sensor	board.
				during compressor operating.
				Current sensor protection stop is
				continuously performed twice.
	Zero cross detecting circuit	5 times	Goes	When zero cross signal cannot be	• Check the connecting
			out	detected while the compressor is	wire among electronic
				operating.	control P.C. board,
				The protection stop of the zero	noise filter P.C. board
					and power board.
				cross detecting circuit is
				continuously performed 10 times.
	Converter	5 times	Goes	When a failure is detected in the	• Replace the power
			out	operation of the converter during	board.
				operation.
	Bus-bar voltage	5 times	Goes	When the bus-bar voltage exceeds
	(1)		out	400V or falls to 200V or below
				during compressor operating.
	Bus-bar voltage	6 times	Goes	When the bus-bar voltage exceeds
	(2)		out	400V or falls to 50V or below during
	wEven if this protection stop is			compressor operating.
	performed continuously three
	times, it does not mean the
	abnormality in outdoor power
	system.

NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-4.).

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