Panasonic CU-2E18NBU service manual Troubleshooting Guide, Self Diagnosis Function

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15. Troubleshooting Guide

15.1 Self Diagnosis Function

šThe display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printed circuit board in the outdoor unit can be used to identify the location of the problem.

Refer to the table below to identify and solve the cause of the problem, and then re-start the air conditioner system.

šIf the problem is solved and operation returns to normal. LED 1 illuminates and others LED are off.

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Contents CU-2E18NBU Disassembly and Assembly Instructions Safety Precautions Page CU-2E18NBU Specificationsš Multi split combination possibility Volume Dimensions Refrigeration Cycle Diagram Block Diagram Wiring Connection Diagram Electronic Circuit Diagram Main Printed Circuit Board Printed Circuit BoardPage Check Points Installation InformationOutdoor Unit Installation InstructionSelect The Best Location Connect the Piping Install The Outdoor UnitCutting and Flaring the Piping Evacuation of the EquipmentHeat Insulation Connect The Cable To The Outdoor UnitCooling Operation Operation ControlOutdoor fan control Annual Cooling controlHeating Operation Powerful OperationSimultaneous Operation Control Operation mode priority controlElectronic Parts Temperature Rise Protection 2 Cool Electronic Parts Temperature Rise Protection 1 CoolProtection Control Freeze Prevention control CoolHeating overload control Heat Cooling overload control CoolIPM power transistor Protection Control Time Delay Safety Control Restart ControlDeice Control 13.10 30 seconds Force OperationCompressor discharge high pressure protection control Compressor Protection Control Gas leak detection controlValve close detection control 14.1 CU-2E18NBU Servicing ModePump down operation SW1 Test Run operationPower Save Mode Wiring Error checkMode priority function Cooling only functionSelf Diagnosis Function Troubleshooting GuidePage Page Outdoor Unit Removal Procedure Disassembly and Assembly InstructionsRemoving the Cabinet Top Plate and Cabinet Front Plate Remove the Control Board Cover and Particular PlatesRemoving the Propeller Fan and Fan Motor Removing the Control P.C. BoardPage One Indoor Unit Operation Technical DataOperation Characteristics 133.000 128.000 100 105 110 115 Outdoor Air Temperature F š Piping Length Characteristic Cooling š Piping Length Characteristic Cooling š Heating Characteristic š Heating Characteristic š Piping Length Characteristic Heating š Piping Length Characteristic Heating Two Indoor Unit Operation CapacitykW š Cooling Characteristic š Piping Length Characteristic Cooling š Piping Length Characteristic Cooling š Piping Length Characteristic Cooling š Heating Characteristic š Heating Characteristic š Heating Characteristic š Piping Length Characteristic Heating š Piping Length Characteristic Heating š Piping Length Characteristic Heating Exploded View and Replacement Parts List REF. no Description & Name ’TY CU-2E18NBU Remark Accessory CO. Drain Elbow

CU-2E18NBU specifications

The Panasonic CU-2E18NBU is a highly efficient outdoor unit designed for residential and commercial applications, providing reliable heating and cooling year-round. This unit is part of Panasonic's extensive range of HVAC solutions, known for their innovation and energy efficiency.

One of the standout features of the CU-2E18NBU is its advanced inverter technology. This technology allows the system to adjust the compressor speed based on the temperature demand, resulting in reduced energy consumption and enhanced comfort. By continuously varying the output, the inverter system maintains a consistent indoor climate without the frequent on/off cycles typical of conventional systems. This not only saves energy but also extends the lifespan of the unit.

The CU-2E18NBU is designed to operate efficiently in a wide range of conditions, showcasing excellent performance in harsh climates. With a capacity of 18,000 BTU, it can efficiently cool or heat spaces effectively, making it suitable for medium-sized rooms or multiple areas when paired with compatible indoor units.

Another significant characteristic of this Panasonic model is its environmentally friendly refrigerant, R32. This refrigerant has a lower impact on global warming and ozone depletion compared to older options, making the CU-2E18NBU a smart choice for eco-conscious consumers. R32 also enhances the system's efficiency, further contributing to lower energy costs.

The unit features a robust construction, allowing it to withstand outdoor conditions while promoting durability. Its compact design allows for flexible installation options, making it easier to fit in various environments without compromising aesthetic appeal.

Moreover, the CU-2E18NBU incorporates advanced air filtration and purification technologies, improving indoor air quality. The filters are designed to capture dust, allergens, and other particulates, ensuring cleaner, healthier air.

In summary, the Panasonic CU-2E18NBU stands out for its efficient inverter technology, environmentally friendly refrigerant, and compact, durable design. With its ability to provide consistent temperature control and improve indoor air quality, this unit is a reliable solution for anyone looking to enhance their heating and cooling systems.
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