Mitsubishi MSH-24NV Service Manual download pdf (Page 25)

10-2-1. Troubleshooting check table

OPERATION

INDICATOR

lamp

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

Self check table

NOTE : When the indoor unit has started operation and the above 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 the

OPERATION INDICATOR lamp flashing.

No.

SymptomOperation indicator lamp Detection method

Checkpoint

0.5-second ON

0.5-second OFF

1-time flash

2.5-second OFF

Mis-Wiring

Serial sig-

nal

Outdoor

thermistor

Indoor coil

thermistor

After 3 minutes from power supply turns ON,

when serial signal is not received.

When serial signal from outdoor unit stops for

4 to 5 seconds.

Thermistors are abnormal when they short

after compressor start-up.

Thermistors are abnormal when they open

after compressor start-up.

• Refer to H "Check of outdoor

thermistor" on page 31.

• Refer to G "How to check

mis-wiring and serial signal

error" on page 30.

• Refer to G "How to check

mis-wiring and serial signal

error" on page 29.

Abnormal

point

Outdoor unit

does not

operate.

Room

tempera-

ture

thermistor

2-time flash

2.5-second OFF

Detect Indoor coil/room temperature

thermistor short or open circuit every 8

seconds during operation.

• Refer to the characteristics of

main indoor coil thermistor,

sub indoor coil thermistor,

and room temperature

thermistor on page 32 or 33.

Outdoor unit

does not

operate.

6-time flash

2.5-second OFF

Outdoor unit

does not

operate.

Outdoor

control

P.C. board

When it cannot properly read data in the

nonvolatile memory of the outdoor control P.C.

board.

• Check the outdoor control

P.C. board.

7-time flash

2.5-second OFF

Outdoor unit

does not run

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Mitsubishi MSH-24NV Service Manual Page 25

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