Mitsubishi Electronics MUZ-GB50VA Instruction of troubleshooting, Operation, Indicator, Emergency

10-3. Instruction of troubleshooting

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	Indoor unit					Indoor unit		OPERATION
	operates.		Indoor unit operates.					INDICATOR
						doesn't	receive
	Outdoor unit		Outdoor unit doesn't					lamp on the indoor
						the signal from
	doesn't		operate normally.					unit is flashing on
						remote controller.
	operate.							and off.
									If blinking of OPERATION
									INDICATOR lamp cannot
									be checked, it can be checked
		Outdoor unit
Outdoor unit				Unit doesn't	Indoor unit		Indoor unit		with failure mode recall function.
		doesn't
operates only				operate	operates, when		doesn't operate,
		operate
in Test Run				normal	EMERGENCY		when		w "Test Run operation" means
		even in
operation.				operation in	OPERATION		EMERGENCY		the operation within 30 minutes
		Test Run
(Refer to 8-3.)				COOL or	switch is pressed.		OPERATION		after EMERGENCY OPERATION
		operation.
w				HEAT mode.			switch is pressed.		switch is pressed.
		(Refer to 8-3.)
		w
Check room		Refer to 10-6.A		Refer to 10-6.C	Refer to		1. Check indoor / outdoor
							connecting wire.
temperature		"How to check		"Check of	"Check of
							(Check if the power
thermistor.		inverter/			remote controller
				R.V. coil".			is supplied to the
Refer to		compressor".			and receiver		indoor unit.)
"Test point					P.C. board".		2. Refer to
diagram and							"Check of indoor		Refer to indoor unit
voltage".							electronic control
							P.C. board and indoor		service manual.
							fan motor".

All lamps	Left lamp	Left lamp
	Flash on and	2-time flash
Flash on and off
at 0.5-second	off at	Cause:
intervals	0.5-second	Indoor unit
Cause:	intervals	• Trouble of
Indoor unit	Cause:	room temp-
• The horizontal	Indoor/	erature/
vane is not	Outdoor unit	indoor coil
installed	• Mis-wiring or	thermistor
correctly.	trouble of
	serial signal.

Left lamp

3-time flash Cause: Indoor unit

•Trouble of indoor fan motor

Left lamp

4-time flash Cause: Indoor unit

•Trouble of indoor unit control system

Left lamp

5-time flash Cause:

Outdoor unit

•Outdoor power system abnormality

Left lamp

6-time flash Cause:

Outdoor unit

•Trouble of thermistor in outdoor unit

Left lamp	Left lamp
7-time flash	14-time flash
Cause:	Cause:
Outdoor unit	Outdoor unit
• Trouble of	• Other
outdoor	abnormality
control
system

	Refer to 10-6.H	Check room
Refer to
"Check of	"How to check	temperature
installation of	mis-wiring	thermistor
the horizontal	and serial	and indoor
vane".	signal error.	coil thermis-
		tor.
		Refer to "Test
		point diagram
		and voltage".

Refer to "Check of indoor fan motor".

Replace the	Refer to 10-6.A	Refer to 10-6.B
indoor	"How to check	"Check of
electronic	inverter/	outdoor
control	compressor".	thermistors".
P.C. board.

Replace	Check 10-2.2.
inverter P.C.	"Flow chart of
board or out-	the detailed
door control	outdoor unit
electronic	failure mode
control P.C.	recall function."
board.

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