Mitsubishi MSZ-A30YV Service Manual download pdf (Page 16)

No.

SymptomOperation indicator lamp Condition

Correspondence

Left lamp flashes.

0.5-second ON

0.5-second OFF

Mis-Wiring

or serial

signal

Outdoor

power

system

Outdoor

thermistors

Outdoor

control

system

Indoor coil

thermistor

When serial signal from outdoor unit is not

received for a maximum of 6 minutes.

When it consecutively occurs 3 times that the

compressor stops for overcurrent protection or

start-up failure protection witth in 1 minute

after start-up.

Outdoor thermistors short or open circuit

during compressor operation.

When it cannot properly read data in the

nonvolatile memory of the inverter P.C. board

or the outdoor electronic control P.C. board.

• Refer to "Check of outdoor

thermistor".

Refer to outdoor unit service

manual.

• Refer to "How to check of

inverter/compressor".

Refer to outdoor unit service

manual .

• Check the stop valve.

• Replace the inverter P.C.

board or the outdoor

electronic control P.C. board.

Refer to outdoor unit service

manual.

• Refer to 9-6.D "How to check

mis-wiring and serial signal

error".

Indoor fan

motor

Abnormal

point

Room

tempera-

ture

thermistor

Left lamp flashes.

2-time flash

2.5-second OFF

When the indoor coil or room temperature

thermistor is short or open circuit.

• Refer to 9-7.the

characteristics of indoor coil

thermistor, and the room

temperature thermistor.

Left lamp flashes.

3-time flash

2.5-second OFF

When rotational frequency feedback signal is

not emit during indoor fan operation.

• Refer to 9-6.A "Check of

indoor fan motor".

Indoor unit

and outdoor

unit do not

operate.

Indoor unit

and outdoor

unit do not

operate.

Left lamp flashes.

5-time flash

2.5-second OFF

Left lamp flashes.

6-time flash

2.5-second OFF

Indoor unit

and outdoor

unit do not

operate.

Indoor unit

and outdoor

unit do not

operate.

Indoor unit

and outdoor

unit do not

operate.

Other

abnormality

An abnormality other than above mentioned is

detected.

• Confirm the abnormality in

detail using the failure mode

recall function for outdoor unit.

Indoor unit

and outdoor

unit do not

operate.

Indoor unit

and outdoor

unit do not

operate.

Left lamp flashes.

4-time flash

2.5-second OFF

Indoor

control

system

When it cannot properly read data in the

nonvolatile memory of indoor electronic

control P.C. board.

Indoor unit

and outdoor

unit do not

operate.

• Replace the indoor electronic

control P.C. board.

Left lamp flashes.

7-time flash

2.5-second OFF

Left lamp flashes.

14-time flash

2.5-second OFF

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.

Lighted

Blinking

Not Lighted

· Flashing of OPERATION INDICATOR lamp (left-hand side lamp)

indicates abnormalities.

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Mitsubishi MSZ-A30YV Service Manual Page 16

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