9-3. INSTRUCTION OF TROUBLESHOOTING

Start

Indoor unit oper- ates.

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 doesn't

 

Indoor unit

 

Indoor unit

operates only

 

unit doesn't

 

operate nor-

 

operates, when

 

doesn't operate,

in Test Run

 

operate even

 

mal operation

 

EMERGENCY

 

when EMER-

operation.

 

in Test Run

 

in COOL or

 

OPERATION

 

GENCY OPERA-

 

 

 

operation.

 

HEAT mode.

 

switch is pressed.

 

TION switch is

 

 

 

 

 

 

 

 

 

 

 

 

pressed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If blinking of OPERATION INDI- CATOR lamp cannot be checked, it can be checked with failure mode recall function.

"Test Run operation" means the operation within 30 minutes af- ter EMERGENCY OPERATION switch is pressed.

Check room temperature thermistor.

Refer to 9-7. "Test point diagram and voltage".

Refer to "How

 

Refer to

 

Refer to 9-6.

to check

 

"Check of R.V.

 

"Check of remote

inverter/

 

coil".

 

controller and

compressor".

 

 

 

indoor elec-

 

 

 

 

tronic control P.C.

 

 

 

 

board".

 

 

 

 

 

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

2.Refer to 9-6. "Check of indoor electronic control P.C. board and indoor fan motor".

Refer to outdoor unit service manual.

POWER lamp

POWER lamp

 

POWER lamp

POWER lamp

 

POWER lamp

POWER lamp

POWER lamp

POWER lamp

Flash on and

2-time flash

 

3-time flash

4-time flash

 

5-time flash

6-time flash

7-time flash

14-time flash

off at 0.5-sec-

Cause:

 

Cause:

Cause:

 

Cause:

Cause:

Cause:

Cause:

ond intervals

Indoor unit

 

Indoor unit

Indoor unit

 

Outdoor unit

Outdoor unit

Outdoor unit

Outdoor unit

Cause:

• Trouble of

 

• Trouble of

• Trouble

 

• Outdoor

• Trouble of

• Trouble of

• Other ab-

Indoor/Outdoor

room tem-

 

indoor fan

of indoor

 

power

thermistor in

outdoor con-

normality

unit

perature /

 

motor

unit control

 

system

outdoor unit

trol system

 

• Miswiring or

indoor coil

 

 

 

system

 

abnormality

 

 

 

trouble of

thermistor

 

 

 

 

 

 

 

 

 

 

 

serial signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to 9-6.

Check room

 

Refer to 9-6.

 

Replace the

 

Refer to

 

Refer to

Replace the

Check "Flow

"How to

temperature

 

"Check of

 

indoor elec-

 

"How to

 

"Check of

inverter P.C.

chart of the

check miswir-

thermistor

 

indoor fan

 

tronic control

 

check invert-

 

outdoor

board or the

detailed

ing and serial

and indoor

 

motor".

 

P.C. board.

 

er/compres-

 

thermistors".

outdoor elec-

outdoor unit

signal error".

coil thermis-

 

 

 

 

 

sor".

 

 

tronic control

failure mode

 

 

tor. Refer

 

 

 

 

 

 

 

 

 

P.C. board.

recall func-

 

 

to 9-7."Test

 

 

 

 

 

 

 

 

 

 

tion."

 

 

point diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

and voltage".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

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Mitsubishi Electronics MSZ-FD09NA service manual Instruction of Troubleshooting

MSZ-FD09NA specifications

The Mitsubishi Electronics MSZ-FD09NA is a wall-mounted split-type air conditioning unit that exemplifies the brand's commitment to efficiency, comfort, and advanced technology. This unit is designed to provide optimal cooling and heating solutions for residential and light commercial spaces, ensuring a comfortable environment year-round.

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