Mitsubishi Electronics PKA-A30KA4.TH, PKA-A36KA4.TH, PKA-A24KA4.TH service manual U9,UH

Page 14

Refer to the following tables for details on the check codes. [Output pattern A]

Beeper sounds Beep

 

 

Beep

Beep

Beep

Beep

 

 

Beep

Beep

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPERATION

 

 

 

 

 

 

 

1st

 

2nd

 

 

3rd

 

 

nth

 

 

 

 

 

1st

 

 

2nd · · · Repeated

INDICATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lamp blink

 

 

 

 

Off

 

 

On

On

 

On

 

On

Off

 

 

On

 

On

pattern

Self-checkApprox. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.

0.5 sec. Approx. 2.5 sec. 0.5 sec.

 

0.5 sec.

 

starts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Start signal

Number of blinks/beeps in pattern indicates the check

Number of blinks/beeps in pattern indicates

 

received)

 

code in the following table (i.e., n=5 for “P5”)

 

the check code in the following table

 

 

 

 

 

 

[Output pattern B]

Beeper sounds Beep

 

 

 

 

OPERATION

 

 

 

 

 

 

 

 

INDICATOR

 

 

 

 

 

 

 

 

lamp blink

 

 

 

 

 

 

 

 

 

 

 

 

Off

 

 

pattern

Self-check

Approx. 2.5 sec.

 

 

starts (Start signal received)

 

 

Beep

Beep

Beep

 

Beep

 

 

 

 

 

 

Beep

Beep

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1st

 

 

2nd

 

 

3rd

 

 

 

nth

 

 

 

 

 

 

 

 

 

1st

 

2nd · · · Repeated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

On

 

 

On

 

On

 

On

 

 

On

 

Off

 

On

 

On

On

Approx. 3 sec.

 

0.5 sec. 0.5 sec. 0.5 sec.

 

0.5 sec.

Approx. 2.5 sec.

 

Approx. 3 sec.

0.5 sec.

0.5 sec.

Number of blinks/beeps in pattern indicates the check

 

Number of blinks/beeps in pattern indicates

code in the following table (i.e., n=5 for “U2”)

 

the check code in the following table

[Output pattern A] Errors detected by indoor unit

IR wireless remote controller

Wired remote controller

 

 

 

 

Beeper sounds/OPERATION

 

Symptom

Remark

INDICATOR lamp blinks

Check code

 

 

 

 

(Number of times)

 

 

 

 

 

1

P1

Intake sensor error

 

 

 

2

P2

Pipe (TH2) sensor error

 

 

 

P9

Pipe (TH5) sensor error

 

 

 

 

 

 

 

3

E6,E7

Indoor/outdoor unit communication error

 

 

 

4

P4

Float switch connector (CN4F) open

 

 

 

5

P5

Drain pump error

 

 

 

PA

Forced compressor stop(due to water leakage abnormality)

 

 

 

 

 

 

 

 

 

 

6

P6

Freezing/Overheating protection operation

 

 

 

7

EE

Communication error between indoor and outdoor units

 

 

 

8

P8

Pipe temperature error

 

 

 

9

E4, E5

Remote controller signal receiving error

 

 

 

10

 

 

 

11

 

 

 

12

Fb

Indoor unit control system error (memory error, etc.)

 

 

 

E0, E3

Remote controller transmission error

 

 

 

E1, E2

Remote controller control board error

 

 

 

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)

IR wireless remote controller

Wired remote controller

 

 

Beeper sounds/OPERATION

 

Symptom

Remark

INDICATOR lamp blinks

Check code

 

 

(Number of times)

 

 

 

1

E9

Indoor/outdoor unit communication error

 

(Transmitting error) (Outdoor unit)

 

 

 

 

2

UP

Compressor overcurrent interruption

 

3

U3,U4

Open/short of outdoor unit thermistors

For details, check

4

UF

Compressor overcurrent interruption (When compressor locked)

the LED display

 

 

Abnormal high discharging temperature/49C operated/

5

U2

of the outdoor

insufficient refrigerant

 

 

controller board.

 

 

Abnormal high pressure (63H operated)/Overheating

6

U1,Ud

As for outdoor

protection operation

 

 

unit, refer to

7

U5

Abnormal temperature of heatsink

outdoor unit's

8

U8

Outdoor unit fan protection stop

service manual.

9

U6

Compressor overcurrent interruption/Abnormal of power module

 

10

U7

Abnormality of superheat due to low discharge temperature

 

11

U9,UH

Abnormality such as overvoltage or voltage shortage and

 

abnormal synchronous signal to main circuit/Current sensor error

 

 

 

 

12

 

13

 

14

Others

Other errors (Refer to the technical manual for the outdoor unit.)

 

*1 If the beeper does not sound again after the initial 2 beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp does not come on, there are no error records.

*2 If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to confirm the self-check start signal was received, the specified refrigerant address is incorrect.

14

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Contents Parts Catalog OCB488 ContentsRevised EDITION-A Remote controller Optional parts Reference ManualSafety Precaution Always Observe for SafetyFront grille When charging directly from cylinderPart Names and Functions Display Section Operation SectionTemperature setting display Operation Mode displayMode Select button Timer displaySpecifications Service RefPKA-A30KA4.TH Noise Criterion CurvesPKA-A24KA4.TH PKA-A24KAL PKA-A30KALUnit inch mm Outlines and DimensionsPKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH Wiring Diagram Explanation of symbolsRefrigerant System Diagram Heat exchangerAccording to 9-4. Troubleshooting by inferior phenomena TroubleshootingTroubleshooting Wired remote controller MALFUNCTION-DIAGNOSIS Method by Remote ControllerProcedure Case of trouble during operationU9,UH Appear even when operation Wired remote controller LED 1, 2 PCB in outdoor unitUnit’s power terminal block L1, L2, GR Remote controller wire shortSELF-DIAGNOSIS Action Table Pipe temperature OperatingErrorE0/signal receiving errorE4 Cause Countermeasure Pipe temperature thermistorRemote controller transmission Condenser-Evaporator TH5Remote controller control board Error Signal receiving errorError Transmitting error Indoor/outdoor unit communicationPerformance failure Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure 1Upward/downward vane ControllerHeat pump type When the remote controller cannot be usedEmergency Operation Cooling Only typeThermistor Lower temperatureCondenser/evaporator temperature Thermistor TH5Sensor signal check DC Fan motor fan motor/indoor controller circuit boardTest Point Diagram Functions of DIP Switch and Jumper Wire Rotation function and Back-up function Outline of functions Special FunctionOperation System constraint2nd stage cut-in setting Request Code ListRotation setting 2nd unit Cut-outBACK-UP Heating Function CN152 How to connectSetting method of each function by wired remote controller Outline of functionsBe careful when removing heavy parts Disassembly ProcedureOperation Procedure Photos & Illustrations PhotoVane Motor and Drain Hose Operation Procedure PhotosRemoving the Nozzle Assembly with Vane Remove the screw fixing motor band. See Photo Disconnect the connector CN44 on the indoor controllerRemove the panel and the corner box. Refer to step Remove the liquid pipe thermistor and cond / eva thermistorRemove the room temperature thermistor Disconnect the connector CN20 on the indoor controller Board

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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