Mitsubishi Electric MSZ-FE12NA Service Manual download pdf (Page 25)

25

Indoor unit oper-

ates.

Outdoor unit

does not operate.

If blinking of OPERATION INDI-

CATOR lamp cannot be checked,

it can be checked with failure

mode recall function.

Indoor unit operates.

Outdoor unit does

not operate normally.

Indoor unit does

not receive the

signal from re-

mote controller.

OPERATION INDICATOR

lamp on the indoor unit is

ﬂ ashing on and off.

Outdoor unit

operates only

in Test Run

operation.

Outdoor unit

does not

operate even

in Test Run

operation.

Unit does not

operate nor-

mal operation

in COOL or

HEAT mode.

Indoor unit

operates, when

EMERGENCY

OPERATION

switch is pressed.

Indoor unit does

not operate,

when EMER-

GENCY OPERA-

TION switch is

pressed.

Check room

temperature

thermistor.

Refer to 9-7.

"Test point

diagram and

voltage".

Refer to "How

to check

inverter/com-

pressor".

Refer to

"Check of R.V.

coil".

Refer to 9-6.

"Check of remote

controller and

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".

POWER

lamp

Upper lamp

Flash on and

off at 0.5-sec-

ond intervals

Cause:

Indoor/Outdoor

unit

• Miswiring or

trouble of

serial signal

POWER

lamp

Upper lamp

2-time ﬂ ash

Cause:

Indoor unit

• Trouble of

room tem-

perature /

indoor coil

thermistor

POWER

lamp

Upper lamp

3-time ﬂ ash

Cause:

Indoor unit

• Trouble of

indoor fan

motor

POWER

lamp

Upper lamp

4-time ﬂ ash

Cause:

Indoor unit

• Trouble

of indoor

unit control

system

POWER

lamp

Upper lamp

5-time ﬂ ash

Cause:

Outdoor unit

• Outdoor

power

system

abnormality

POWER

lamp

Upper lamp

6-time ﬂ ash

Cause:

Outdoor unit

• Trouble of

thermistor in

outdoor unit

POWER

lamp

Upper lamp

7-time ﬂ ash

Cause:

Outdoor unit

• Trouble of

outdoor con-

trol system

POWER

lamp

Upper lamp

14-time ﬂ ash

Cause:

Outdoor unit

• Other ab-

normality

Start

Refer to 9-6.

"How to

check miswir-

ing and serial

signal error".

Check room

temperature

thermistor

and indoor

coil thermis-

tor. Refer

to 9-7."Test

point diagram

and voltage".

Refer to 9-6.

"Check of

indoor fan

motor".

Replace the

indoor elec-

tronic control

P.C. board.

Refer to

"How to

check invert-

er/compres-

sor".

Refer to

"Check of

outdoor

thermistors".

Check "Flow

chart of the

detailed

outdoor unit

failure mode

recall func-

tion."

"Test Run operation" means the

operation within 30 minutes af-

ter EMERGENCY OPERATION

switch is pressed.

Refer to outdoor unit service manual.

Replace the

inverter P.C.

board or the

outdoor elec-

tronic control

P.C. board.

9-3. INSTRUCTION OF TROUBLESHOOTING

POWER lamp: MSZ-FE09/12NA

Upper lamp: MSZ-FE18NA

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