Mitsubishi Electronics MSZ-FD25VAS, MSZ-FD35VAS Instruction of Troubleshooting, Start

Refer to 10-6. Refer to 10-6. Check room Refer to 10-6. Replace the Refer to

of serial signal

POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp

10-3. INSTRUCTION OF TROUBLESHOOTING

Start

w"Test Run operation" means the operation within 30 minutes after

EMERGENCY OPERATION switch is pressed.

If blinking of OPERATION INDICATOR lamp cannot

be checked, it can be checked with failure mode recall function.

Indoor unit operates. 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
operates only	doesn't
in Test Run	operate
operation. w	even in
	Test Run
	operation. w

Check room	Refer to
temperature	"How to check
thermistor.	inverter/
Refer to 10-7.	compressor".
"Test point
diagram and
voltage".

Unit doesn't	Indoor unit
operate	operates, when
normal	EMERGENCY
operation in	OPERATION
COOL or	switch is pressed.
HEAT mode.

Refer to	Refer to 10-6.B
"Check of	"Check of
R.V. coil".	remote controller
	and receiver
	P.C. board".

Indoor unit doesn't operate, when

EMERGENCY

OPERATION switch is pressed.

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

2.Refer to 10-6.C"Check of indoor electronic control P.C. board and indoor fan motor".

PLASMA lamp 2-time flash cause:

Indoor unit

•Trouble of PLASMA operation

Refer to 10-6.F"Check of PLASMA operation".

Refer to outdoor unit service manual.

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

3-time flash Cause: Indoor unit

•Trouble of indoor fan motor

4-time flash Cause: Indoor unit

•Trouble of indoor unit control system

5-time flash	6-time flash	7-time flash	14-time flash
Cause:	Cause:	Cause:	Cause:
Outdoor unit	Outdoor unit	Outdoor unit	Outdoor unit
• Outdoor	• Trouble of	• Trouble of	• Other
power	thermistor	outdoor	abnormality
system	in outdoor	control
abnormality	unit	system

E "Check of	D "How to
installation of	check of
the horizontal	miswiring
vane".	and serial
	signal error.

temperature	A "Check of	indoor
thermistor	indoor fan	electronic
and indoor	motor".	control
coil thermis-		P.C. board.
tor.
Refer to 10-7.
"Test point
diagram and
voltage".

	Refer to	Replace the	Check
"How to check	"Check of	inverter P.C.	"Flow chart of
inverter/	outdoor	board or	the detailed
compressor".	thermistors".	the outdoor	outdoor unit
		electronic	failure mode
		control P.C.	recall function."
		board.

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