2. Indoor unit failure mode table

Left lamp of OPERATION

Abnormal point

Condition

 

Correspondence

INDICATOR lamp

(Failure mode)

 

 

 

 

Not lighted

Normal

 

1-time flash every

Room temperature

The room temperature thermistor short or

Refer to the characteristics of the room temperature

open circuit is detected every 8 seconds dur-

0.5-second

thermistor

ing operation.

thermistor (8-7.).

 

 

 

 

2-time flash

Indoor coil

The indoor coil thermistor short or open circuit

Refer to the characteristics of the main indoor coil ther-

2.5-second OFF

thermistor

is detected every 8 seconds during operation.

mistor, the sub indoor coil thermistor (8-7.).

3-time flash

Serial signal

The serial signal from outdoor unit is not re-

Refer to 8-6.

"How to check miswiring and serial

2.5-second OFF

ceived for a maximum of 6 minutes.

signal error".

 

 

 

11-time flash

 

The rotational frequency feedback signal is

 

 

Indoor fan motor

not emit during the 12 seconds the indoor fan

Refer to 8-6.

"Check of indoor fan motor".

2.5-second OFF

 

operation.

 

 

 

 

 

 

12-time flash

Indoor control

It cannot properly read data in the nonvolatile

 

 

memory of the indoor electronic control P.C.

Replace the indoor electronic control P.C. board.

2.5-second OFF

system

board.

 

 

 

 

 

 

NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (8-4.).

14

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Logitech OB450 REVISED EDITION-B, MSZ-A09NA service manual Indoor unit failure mode table

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