9-4. TROUBLESHOOTING CHECK TABLE

Before taking measures, make sure that the symptom reappears for accurate troubleshooting.

When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing.

 

 

L AREA R

POWER

Lighted

 

 

 

 

 

 

 

Blinking

 

 

 

 

 

 

 

Not lighted

 

 

 

No.

Abnormal

Operation indicator lamp

Symptom

Condition

Correspondence

point

 

 

 

 

 

 

 

 

 

POWER lamp flashes.

 

 

 

 

 

 

Miswiring

0.5-second ON

 

 

 

• Refer to 9-6.

"How to check

 

 

 

 

The serial signal from the outdoor unit is not

1

or serial

 

 

 

miswiring and serial signal er-

 

 

 

received for 6 minutes.

 

signal

 

 

 

ror".

 

 

 

 

 

 

 

 

 

0.5-second OFF

 

 

 

 

 

 

Indoor coil

POWER lamp flashes.

 

 

 

 

 

 

2-time flash

 

 

 

• Refer to 9-7.the characteristics

 

thermistor

 

 

 

2

 

 

 

 

The indoor coil or the room temperature

of indoor coil thermistor, and

Room tem-

 

 

 

thermistor is short or open circuit.

the room temperature thermis-

 

 

 

 

 

perature

 

 

 

 

tor.

 

 

thermistor

2.5-second OFF

 

 

 

 

 

 

 

POWER lamp flashes.

 

 

 

 

 

 

 

3-time flash

 

 

 

 

 

3

Indoor fan

 

 

 

The rotational frequency feedback signal is

• Refer to 9-6.

"Check of in-

motor

 

 

 

not emitted during the indoor fan operation.

door fan motor".

 

 

 

 

 

 

2.5-second OFF

 

 

 

 

 

 

POWER lamp flashes.

 

 

 

 

 

 

 

4-time flash

 

 

It cannot properly read data in the nonvolatile

 

 

 

Indoor con-

 

 

 

• Replace the indoor electronic

4

 

 

 

memory of the indoor electronic control P.C.

trol system

 

 

 

control P.C. board.

 

 

 

 

board.

 

 

 

 

 

 

 

 

 

2.5-second OFF

Indoor unit and

 

 

 

 

 

POWER lamp flashes.

 

outdoor unit do

 

 

 

 

 

 

not operate.

 

 

 

 

 

5-time flash

 

It consecutively occurs 3 times that the com-

• Refer to "How to check of in-

 

 

 

 

 

Outdoor

 

 

 

verter/compressor".

 

 

 

 

pressor stops for overcurrent protection or

5

power sys-

 

 

 

Refer to outdoor unit service

 

 

 

start-up failure protection within 1 minute after

 

tem

 

 

 

manual

 

 

 

 

 

start-up.

 

 

 

 

 

 

• Check the stop valve.

 

 

2.5-second OFF

 

 

 

 

 

 

 

 

 

 

POWER lamp flashes.

 

 

 

 

 

 

 

6-time flash

 

 

 

• Refer to "Check of outdoor

6

Outdoor

 

 

 

The outdoor thermistors short or open circuit

thermistor".

 

thermistors

 

 

 

during the compressor operation.

Refer to outdoor unit service

 

 

 

 

 

 

manual.

 

 

 

 

2.5-second OFF

 

 

 

 

 

 

POWER lamp flashes.

 

 

 

• Replace the inverter P.C. board

 

Outdoor

7-time flash

 

 

It cannot properly read data in the nonvolatile

7

 

 

 

or the outdoor electronic con-

control sys-

 

 

 

memory of the inverter P.C. board or the out-

trol P.C. board.

 

tem

 

 

 

door electronic control P.C. board.

Refer to outdoor unit service

 

 

 

2.5-second OFF

 

 

manual.

 

 

 

 

 

 

 

 

 

 

POWER lamp flashes.

 

 

 

 

 

 

 

14-time flash

 

 

 

• Check the stop valve.

8

Other ab-

 

 

 

An abnormality other than above mentioned

• Confirm the abnormality in

normality

 

 

 

is detected.

detail using the failure mode

 

 

 

 

 

 

recall function for outdoor unit.

 

 

2.5-second OFF

 

 

 

 

 

Outdoor

 

 

Outdoor unit

It cannot properly read data in the nonvolatile

• Check the blinking pattern of

 

 

 

the LED on the inverter P.C.

9

control sys- POWER lamp lights up

 

does not oper- memory of the inverter P.C. board or the out-

 

board or the outdoor electronic

 

tem

 

 

ate

door electronic control P.C. board.

 

 

 

control P.C. board.

 

 

 

 

 

 

26

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Mitsubishi Electronics MSZ-FD09NA service manual Troubleshooting Check Table, Lighted Blinking

MSZ-FD09NA specifications

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