Mitsubishi Electronics PKA-A36KA4.TH Cause, Wired remote controller LED 1, 2 PCB in outdoor unit

Page 15

•On IR wireless remote controller

The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp

•On wired remote controller

Check code displayed in the LCD. (Refer to the previous page, check code.)

• If the unit cannot be operated properly after the test run, refer to the following table to find out the cause.

 

Symptom

 

Cause

Wired remote controller

LED 1, 2 (PCB in outdoor unit)

 

PLEASE WAIT

For about 2

After LED 1, 2 are lighted, LED 2 is

•For about 2 minutes following power-on,op-

minutes after

turned off, then only LED 1 is

eration of the remote controller is not possible

 

power-on

lighted. (Correct operation)

due to system start-up. (Correct operation)

 

 

Only LED 1 is lighted.

•Connector for the outdoor unit’s protection

PLEASE WAIT Error code

 

device is not connected.

Subsequent to

LED 1, 2 blink.

•Reverse or open phase wiring for the outdoor

 

about 2 minutes

 

unit’s power terminal block (L1, L2, GR)

Display messages do not

after power-on

Only LED 1 is lighted.

•Incorrect wiring between indoor and outdoor

appear even when operation

 

LED 1 blinks twice,

units (incorrect polarity of S1, S2, S3)

switch is turned ON (operation

 

•Remote controller wire short

 

LED 2 blinks once.

lamp does not light up).

 

 

 

On the IR wireless remote controller with condition above, following phenomena take place.

•No signals from the remote controller can be received.

•OPE lamp is blinking.

•The buzzer makes a short ping sound.

Note:

Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

LED1 (power for microprocessor)

Indicates whether control power is supplied. Make sure that this LED is

 

always lit.

LED2 (power for wired remote controller)

Indicates whether power is supplied to the wired remote controller.

 

This LED lights only in the case of the indoor unit which is connected to the

 

outdoor unit refrigerant addresses “0”.

 

 

LED3 (communication between indoor and

Indicates state of communication between the indoor and outdoor units.

outdoor units)

Make sure that this LED is always blinking.

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Contents Contents Revised EDITION-AParts Catalog OCB488 Reference Manual Remote controller Optional partsAlways Observe for Safety Safety PrecautionWhen charging directly from cylinder Part Names and FunctionsFront grille Operation Section Display SectionTimer display Operation Mode displayMode Select button Temperature setting displayService Ref SpecificationsPKA-A24KAL PKA-A30KAL Noise Criterion CurvesPKA-A24KA4.TH PKA-A30KA4.THOutlines and Dimensions PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.THUnit inch mm Explanation of symbols Wiring DiagramHeat exchanger Refrigerant System DiagramTroubleshooting TroubleshootingAccording to 9-4. Troubleshooting by inferior phenomena Case of trouble during operation MALFUNCTION-DIAGNOSIS Method by Remote ControllerProcedure Wired remote controllerU9,UH Remote controller wire short Wired remote controller LED 1, 2 PCB in outdoor unitUnit’s power terminal block L1, L2, GR Appear even when operationSELF-DIAGNOSIS Action Table Operating Pipe temperatureCondenser-Evaporator TH5 Cause Countermeasure Pipe temperature thermistorRemote controller transmission ErrorE0/signal receiving errorE4Indoor/outdoor unit communication Error Signal receiving errorError Transmitting error Remote controller control boardController Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure 1Upward/downward vane Performance failureCooling Only type When the remote controller cannot be usedEmergency Operation Heat pump typeThermistor TH5 Lower temperatureCondenser/evaporator temperature ThermistorDC Fan motor fan motor/indoor controller circuit board Sensor signal checkTest Point Diagram Functions of DIP Switch and Jumper Wire System constraint Special FunctionOperation Rotation function and Back-up function Outline of functions2nd unit Cut-out Request Code ListRotation setting 2nd stage cut-in settingOutline of functions How to connectSetting method of each function by wired remote controller BACK-UP Heating Function CN152Photo Disassembly ProcedureOperation Procedure Photos & Illustrations Be careful when removing heavy partsOperation Procedure Photos Removing the Nozzle Assembly with VaneVane Motor and Drain Hose Remove the liquid pipe thermistor and cond / eva thermistor Disconnect the connector CN44 on the indoor controllerRemove the panel and the corner box. Refer to step Remove the screw fixing motor band. See PhotoDisconnect the connector CN20 on the indoor controller Board Remove the room temperature thermistor

PKA-A36KA4.TH, PKA-A30KA4.TH, PKA-A24KA4.TH specifications

Mitsubishi Electronics introduces its PKA series of commercial air conditioners, comprising models PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH. These units are designed to meet the growing demand for energy-efficient and reliable climate control solutions in commercial spaces. Each model in the series is equipped with advanced features that set them apart in the competitive air conditioning market.

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