Vermont Casting MSY-D30NA, MSZ-D36NA Troubleshooting Check Table, Lighted Blinking Not lighted

Page 23

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.

OPERATION INDICATOR

Lighted

Blinking

Not lighted

No.

Abnormal

Operation indicator lamp

Symptom

Condition

Correspondence

point

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

 

0.5-second ON

 

 

1

Miswiring or

and outdoor

The serial signal from the outdoor unit is not

• Refer to 9-6. "How to check miswiring

 

 

serial signal

 

unit do not

received for a maximum of 6 minutes.

and serial signal error".

 

 

0.5-second OFF

operate.

 

 

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

Indoor coil

2-time flash

 

 

 

 

thermistor

Indoor unit

 

• Refer to 9-7.the characteristics of indoor

 

 

 

and outdoor

The indoor coil or the room temperature

2

 

 

coil thermistor, and the room tempera-

 

 

unit do not

thermistor is short or open circuit.

 

 

2.5-second OFF

ture thermistor.

 

Room

operate.

 

 

 

 

 

 

temperature

 

 

 

 

 

thermistor

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

Indoor fan

3-time flash

The rotational frequency feedback signal is not • Refer to 9-6. "Check of indoor fan mo-

3

and outdoor

motor

 

unit do not

emitted during the indoor fan operation.

tor".

 

 

2.5-second OFF

operate.

 

 

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

Indoor con-

4-time flash

It cannot properly read data in the nonvolatile

• Replace the indoor electronic control

4

 

and outdoor

trol system

 

unit do not

memory of the indoor electronic control P.C.

P.C. board.

 

 

2.5-second OFF

operate.

board.

 

 

 

 

 

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

Outdoor

5-time flash

Indoor unit

It consecutively occurs 3 times that the

• Refer to "How to check of inverter/

 

 

and outdoor

compressor stops for overcurrent protection or

compressor".

5

power sys-

 

 

unit do not

start-up failure protection within 1 minute after

Refer to outdoor unit service manual.

 

tem

 

 

 

operate.

start-up.

• Check the stop valve.

 

 

2.5-second OFF

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

 

Outdoor

6-time flash

The outdoor thermistors short or open circuit

• Refer to "Check of outdoor thermistor".

6

 

and outdoor

thermistors

 

unit do not

during the compressor operation.

Refer to outdoor unit service manual.

 

 

2.5-second OFF

operate.

 

 

 

 

 

 

 

 

 

Left lamp flashes.

Indoor unit

 

 

7

Outdoor con-

7-time flash

It cannot properly read data in the nonvola-

• Replace the inverter P.C. board or the

 

and outdoor

tile memory of the inverter P.C. board or the

outdoor electronic control P.C. board.

 

trol system

 

unit do not

outdoor electronic control P.C. board.

Refer to outdoor unit service manual.

 

 

 

operate.

 

 

2.5-second OFF

 

 

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

 

14-time flash

Indoor unit

 

• Confirm the abnormality in detail using

 

Other abnor-

 

An abnormality other than above mentioned is

8

 

and outdoor

mality

 

unit do not

detected.

the failure mode recall function for

 

 

2.5-second OFF

operate.

 

outdoor unit.

 

 

 

 

 

 

 

 

 

23

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Contents MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Page Technical Changes Part Names and Functions AccessoriesSpecification Outlet AIR Speed and Coverage Range Operating RangeMSZ-D36NA MSY-D30NA MSY-D36NA Outlines and DimensionsWiring Diagram Unitinch Refrigerant System DiagramP.C. Board Modification for Individual Operation Service FunctionsTimer Short Mode How to modify the remote controller P.C. boardOperation Auto Restart FunctionMicroprocessor Control Operation Indicator lampFeel Control Operation MSY Cool OperationHeat Operation MSZ FAN Operation MSYFuzzy control Auto Change Over ··· Auto Mode Operation MSZMode selection Auto Vane Operation 3 4 Swing 5 Vertical vaneProgram Timer EMERGENCY/TEST Operation Minute Time Delay OperationChanging Temperature Indication F /C How to replace batteries TroubleshootingBefore troubleshooting, check the following Troubleshooting procedureOFF Failure Mode Recall FunctionEration Indica Indoor unit failure mode tableStart Instruction of TroubleshootingLighted Blinking Not lighted Troubleshooting Check TableTrouble Criterion of Main Parts Check of indoor fan motor Troubleshooting FlowCheck of remote controller and receiver P.C. board Indoor electronic control P.C. board How to check miswiring and serial signal error Electromagnetic noise enters into TV sets or radios SW P.C. board Test Point Diagram and VoltagePower monitor receiver P.C. board Removing the electrical box, the electronic control P.C Disassembly InstructionsBoard, the power monitor receiver P.C. board and the SW Removing the panelRemoving the horizontal vane motor Removing the nozzle assemblyRemoving the vertical vane motor Removing the line flow fan and the indoor fan motor Page Page Made in Japan New publication, effective FebDistributed in Feb . No. OBH501
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