Instruction of troubleshooting | Mitsubishi Electronics MSZ-FA35VA

POWER lamp POWER lamp POWER lamp Left lamp

9-3. Instruction of troubleshooting

Start

w"Test Run operation"	If blinking of OPERATION
means the operation	INDICATOR lamp cannot
within 30 minutes after	be checked, it can be checked
EMERGNCY OPERATION	with failure mode recall function.
switch is pressed.

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.

OPERATION INDICATOR lamp on the indoor unit stays off.

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

Check room		Refer to
temperature		"How to check
thermistor.		inverter/
Refer to 9-7.		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 9-6.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 9-6.C"Check of indoor electronic control P.C. board and indoor fan motor".

PLASMA/WASH lamp 2-time flash

cause: Indoor unit

•Trouble of PLASMA DEODORIZNG power control or PLASMA AIR PURIFYING power control

Replace the indoor electronic control P.C. board.

As for outdoor unit MUZ type, refer to service manual OB372. As for outdoor unit MXZ type, refer to service manual OB377.

All lamps	Flash on and off	2-time flash
Flash on and off
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	• Mis-wiring	indoor coil
installed	or trouble	thermistor
correctly.	of serial signal




Refer to 9-6.	Refer to 9-6.	Check room
E "Check of	D "How to	temperature
installation of	check of	thermistor
the horizontal	mis-wiring	and indoor
vane".	and serial	coil thermis-
	signal error	tor.
	(when	Refer to 9-7.
	outdoor unit	"Test point
	doesn't work)".	diagram and
		voltage".

POWER lamp

3-time flash

of AREA lamp

5-time flash

6-time flash

7-time flash

14-time flash

Cause:

4-time flash

Cause:

Indoor unit

Cause:

Outdoor unit

• Trouble of

Indoor unit

• Outdoor

• Trouble of

• Other

indoor fan

• Trouble of

power

thermistor

outdoor

abnormality

motor

indoor unit

system

in outdoor

control

abnormality

unit

system

Refer to 9-6.

Replace the

Refer to

Replace the

Check

A "Check of

indoor

"How to check

"Check of

inverter P.C.

"Flow chart of

indoor fan

electronic

inverter/

outdoor

board or

the detailed

motor".

control

compressor".

thermistors".

the outdoor

outdoor unit

P.C. board.

electronic

failure mode

control P.C.

recall function."

board.