Mitsumi electronic PLA-A24AA, PLA-A30AA Troubleshooting by Inferior Phenomena, Is off, Ply system

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10-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

Note: Refer to the manual of outdoor unit for the detail of remote controller.

Phenomena

Cause

Countermeasure

(1)LED2 on indoor controller board • When LED1 on indoor controller board is also off.

 

is off.

1 Power supply of rated voltage is not supplied to out-

1 Check the voltage of outdoor power

 

door unit.

supply terminal block (L1,L2).

 

 

• When AC 208/230V is not detected,

 

 

check the power wiring to outdoor unit

 

 

and the breaker.

 

 

• When AC 208/230V is detected,

 

 

check 2 (below).

 

2 Defective outdoor controller circuit board

2 Check the voltage between outdoor

 

 

terminal block S1 and S2.

 

 

• When AC 208/230V is not detected.

 

 

—Check the fuse on outdoor controller

 

 

circuit board.

 

 

—Check the wiring connection.

 

 

• When AC 208/230V is detected,

 

 

check 3 (below).

 

3 Power supply of 208/230V is not supplied to indoor

3 Check the voltage between indoor terminal

 

unit.

block S1 and S2.

 

 

• When AC 208/230V is not detected,

 

 

check indoor/outdoor unit connecting

 

 

wire for miswiring.

 

 

• When AC 208/230V is detected,

 

 

check 4 (below).

 

4 Defective indoor power board

4 Check voltage output from CN2S on indoor

 

 

power board (DC13.1V). Refer to 10-7-1.

 

 

• When no voltage is output, check the

 

 

wiring connection.

 

 

• When output voltage is between

 

 

DC12.5V and DC13.7V, check 5

 

 

(below).

 

5 Defective indoor controller board

5 Check the wiring connection between

 

 

indoor controller board and indoor power

 

 

board. Check the fuse on indoor controller

 

 

board. If no problems are found, indoor

 

 

controller board is defective.

(For the separate indoor/outdoor unit power sup-

 

ply system)

1 Check the voltage of indoor power supply

1 Power supply of 208/230V AC is not supplied to

indoor unit.

terminal block (L1,L2).

 

• When AC208/230V is not detected,

 

check the power supply wiring.

 

• When AC208/230V is detected, check

 

2 (below).

2 The connectors of the optional replacement kit are

2 Check that there is no problem in the

not used.

method of connecting the connectors.

 

• When there are problems in the method

 

of connecting the connectors, connect

 

the connector correctly referring to instal-

 

lation manual of an optional kit.

 

• When there is no problem in the

 

method of connecting the connectors,

 

check 3 (below).

3 Defective indoor controller board

3 Check voltage output from CNDK on

 

indoor controller board.

 

• When AC208/230V is not detected.

 

—Check the fuse on indoor controller board.

 

—Check the wiring connection between

 

indoor power supply terminal block and

 

CND on indoor controller board.

 

• When AC208/230V is detected, check

 

4 (below).

4 Defective indoor power board

4 Check voltage output from CN2S on

 

indoor power board.

 

• When no voltage output, check the

 

wiring connection between CNDK on

 

indoor controller board and CNSK on

 

indoor power board.

 

If no problem are found, indoor power

 

board is defective.

 

• When DC12.5~13.7V is detected,

 

check the wiring connection between

 

CN2S on indoor power board and

 

CN2D on indoor power board.

 

If no problem are found, indoor con-

 

troller board is defective.

22

Image 22
Contents Contents Revised EDITION-BReference Manual Technical Data BookTechnical Changes PLA-A12AA PLA-A18AA PLA-A24AA PLA-A30AA PLA-A36AA PLA-A42AASafety Precaution Always Observe for SafetyAdditional refrigerant charge Part Names and Functions Indoor UnitDisplay Section Wireless remote controller Service Ref SpecificationsPLA-A24AA/ PLA-A24AA1Single phase,60Hz, 208/230V PLA-A36AA/ PLA-A36AA1Single phase,60Hz, 208/230V PLA-A30AA/ PLA-A30AA1Single phase,60Hz, 208/230VPLA-A42AA/ PLA-A42AA1Single phase,60Hz, 208/230V PLA-A12AA1 Noise Criterion CurvesPLA-A12AA PLA-A36AAOutlines and Dimensions Unit inchmmWiring Diagram Please set the voltage usingRefrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingMALFUNCTION-DIAGNOSIS Method by Remote Controller Case of trouble during operationOutput pattern B Only A-CONTROL Please Wait SELF-DIAGNOSIS Action Table Cause Countermeasure Freezing/overheating protection is Pipe temperatureWorking ErrorE0/signal receiving errorE4 Cause Countermeasure Pipe temperature thermistorRemote controller transmission ErrorE3/signal receiving errorE5Remote controller control board Error Signal receiving errorError Transmitting error Indoor controller boardIs off Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure Ply system3Upward/downward vane 4Receiver for wireless remoteIs blinking Performance failureEmergency Operation Fan motor MF Thermistor for lower temperature Test Point Diagram Indoor controller board Functions of DIP Switch and Jumper Wire SW2Disassembly Procedure Operating Procedure Photos & IllustrationsRemoving the fan motor Removing the drain pump and drain sensor Wiring Recom QtyPLA-A·AA Functional and Structural Parts PLA-A36AA98 PLA-A42AA 12, 18, 24 Symbol Qty MendedFunctional and Structural Parts PLA-A36AA PLA-A42AA 556RoHS Parts List 30/36/42AA1Functional and Structural Parts WiringSymbol Qty PLA-A18AA1 PLA-A24AA1PLA-A30AA1PLA-A36AA198 RoHS Parts No Parts Name Functional and Structural Parts PLA-A36AA1 PLA-A42AA1 RemarksPage Made in Japan

PLA-A30AA, PLA-A42AA, PLA-A18AA, PLA-A12AA, PLA-A24AA specifications

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