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

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9 TROUBLESHOOTING

9-1. TROUBLESHOOTING

<Error code display by self-diagnosis and actions to be taken for service (summary)>

Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit. Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents below before investigating details.

Unit conditions at service

Error code

Actions to be taken for service (summary)

 

Displayed

Judge what is wrong and take a corrective action

 

according to “9-3. Self-diagnosis action table”.

 

 

The trouble is reoccurring.

Not displayed

Conduct troubleshooting and ascertain the cause of the trouble

 

according to “9-4. Troubleshooting by inferior phenomena”.

 

 

 

 

Consider the temporary defects such as the work of

 

 

protection devices in the refrigerant circuit including

 

 

compressor, poor connection of wiring, noise and etc.

 

Logged

Re-check the symptom, and check the installation

 

environment, refrigerant amount, weather when the

 

 

trouble occurred, matters related to wiring and etc.

The trouble is not reoccurring.

 

Reset error code logs and restart the unit after finishing service.

 

There is no abnormality in electrical component,

 

 

controller board,remote controller and etc.

 

 

Re-check the abnormal symptom.

 

 

Conduct trouble shooting and ascertain the cause of the trouble

 

Not logged

according to “9-4. Troubleshooting by inferior phenomena”.

 

Continue to operate unit for the time being if the cause

 

 

is not ascertained.

 

 

There is no abnormality concerning of parts such as electrical

 

 

component, controller board, remote controller and etc.

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Contents Contents Revised EDITION-AParts Catalog OCB488 Remote controller Optional parts Reference ManualSafety Precaution Always Observe for SafetyWhen charging directly from cylinder Part Names and FunctionsFront grille Display Section Operation SectionOperation Mode display Mode Select buttonTemperature setting display Timer displaySpecifications Service RefNoise Criterion Curves PKA-A24KA4.THPKA-A30KA4.TH PKA-A24KAL PKA-A30KALOutlines and Dimensions PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.THUnit inch mm Wiring Diagram Explanation of symbolsRefrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingAccording to 9-4. Troubleshooting by inferior phenomena MALFUNCTION-DIAGNOSIS Method by Remote Controller ProcedureWired remote controller Case of trouble during operationU9,UH Wired remote controller LED 1, 2 PCB in outdoor unit Unit’s power terminal block L1, L2, GRAppear even when operation Remote controller wire shortSELF-DIAGNOSIS Action Table Pipe temperature OperatingCause Countermeasure Pipe temperature thermistor Remote controller transmissionErrorE0/signal receiving errorE4 Condenser-Evaporator TH5Error Signal receiving error Error Transmitting errorRemote controller control board Indoor/outdoor unit communicationTroubleshooting by Inferior Phenomena Phenomena Cause Countermeasure 1Upward/downward vanePerformance failure ControllerWhen the remote controller cannot be used Emergency OperationHeat pump type Cooling Only typeLower temperature Condenser/evaporator temperatureThermistor Thermistor TH5Sensor signal check DC Fan motor fan motor/indoor controller circuit boardTest Point Diagram Functions of DIP Switch and Jumper Wire Special Function OperationRotation function and Back-up function Outline of functions System constraintRequest Code List Rotation setting2nd stage cut-in setting 2nd unit Cut-outHow to connect Setting method of each function by wired remote controllerBACK-UP Heating Function CN152 Outline of functionsDisassembly Procedure Operation Procedure Photos & IllustrationsBe careful when removing heavy parts PhotoOperation Procedure Photos Removing the Nozzle Assembly with VaneVane Motor and Drain Hose Disconnect the connector CN44 on the indoor controller Remove the panel and the corner box. Refer to stepRemove the screw fixing motor band. See Photo 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.

One of the main features of the PKA series is the innovative inverter technology. This technology enables the air conditioning units to adjust their cooling or heating output according to the indoor temperature, leading to significant energy savings. By operating at varying speeds rather than a constant rate, the inverter system provides a more consistent and comfortable environment while reducing energy consumption by up to 30% compared to traditional fixed-speed systems.

Another standout characteristic of the PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH models is their compact design. These units are designed for easy installation in various commercial settings while taking up minimal space. This is particularly beneficial for businesses looking to optimize their floor space without compromising climate control efficiency.

The PKA series features advanced filtration technology, including a highly efficient air purification system. This enhances indoor air quality by removing dust, allergens, and other airborne pollutants, creating a healthier environment for occupants. The inclusion of a self-cleaning function also contributes to maintenance ease, as the unit automatically cleans the heat exchanger, preventing dust buildup and ensuring efficient operation.

Mitsubishi's commitment to whisper-quiet operation is another critical feature of these models. They are engineered to operate at sound levels as low as 19 dB(A), making them ideal for environments where noise control is essential, such as offices, hotels, or healthcare facilities.

Moreover, the PKA series is compatible with Mitsubishi's sophisticated control systems, allowing users to manage their air conditioning remotely via smartphone or tablet. This level of control enhances user convenience and maximizes system efficiency by enabling real-time adjustments based on occupancy and other factors.

Overall, the Mitsubishi Electronics PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH units represent a perfect blend of modern technology and user-centric design, providing businesses with effective, efficient, and quiet climate control solutions. With their advanced features, energy-saving capabilities, and emphasis on air quality, these models stand out as premier choices for managing environmental comfort in commercial applications.
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