8-3. 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 after EMERGENCY OPERA- TION switch is pressed.

Check room temperature thermistor.

Refer to 8-7. "Test point diagram and voltage".

Refer to "How

 

Refer to

 

Refer to 8-6.

to check

 

"Check of R.V.

 

"Check of remote

inverter/com-

 

coil".

 

controller and

pressor".

 

 

 

receiver P.C.

 

 

 

 

board".

 

 

 

 

 

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

2.Refer to 8-6. "Check of indoor electronic control P.C. board and indoor fan motor".

Refer to outdoor unit service manual.

Left lamp

Left lamp

 

Left lamp

Left lamp

 

Left lamp

Left lamp

 

Left lamp

Left 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

 

• Trouble of

• Trouble

 

• Outdoor

• Trouble of

 

• Trouble of

• Other ab-

Indoor/Outdoor

of room

 

indoor fan

of indoor

 

power

thermistor in

 

outdoor con-

normality

unit

temperature

 

motor

unit control

 

system

outdoor unit

 

trol system

 

• Miswiring or

/ indoor coil

 

 

 

system

 

abnormality

 

 

 

 

trouble of

thermistor

 

 

 

 

 

 

 

 

 

 

 

 

serial signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to 8-6.

Check room

 

Refer to 8-6.

 

Replace the

 

Refer to

 

Refer to

 

Check "Flow

"How to

temperature

 

"Check of

 

indoor elec-

 

"How to

 

"Check of

 

inverter P.C.

chart of the

check mis-

thermistor

 

indoor fan

 

tronic control

 

check

 

outdoor ther-

 

board or

detailed

wiring and

and indoor

 

motor".

 

P.C. board.

 

inverter/com-

 

mistors".

 

the outdoor

outdoor unit

serial signal

coil thermis-

 

 

 

 

 

pressor".

 

 

 

electronic

failure mode

error".

tor. Refer

 

 

 

 

 

 

 

 

 

 

control P.C.

recall func-

 

 

to 8-7."Test

 

 

 

 

 

 

 

 

 

 

board.

tion."

 

 

point diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and voltage".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

Page 15
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Logitech MSZ-A09NA, OB450 REVISED EDITION-B service manual Instruction of Troubleshooting, Start

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