Problems

Inspection

points

Others

Breaker

Refrigerant gas pressure

 

Indoor unit

 

 

 

 

Outdoor unit

 

 

 

Others

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor unit does not operate.

 

Operation lamp blinking.

Operation lamp does not illuminate.

 

Indoor fan dose not turn.

Outdoor unit does not operate.

Outdoor fan dose not turn.

4-way valve does not operate.

The compressor (only) does not operate.

The compressor stops on occasion.

The compressor speed does not increase.

The outdoor air temperature is high, however defrost operation occurs.

Defrost operation does not occur.

The electric expansion valve does not operate.

Does not cool or cooling performance is inadequate.

Does not heat or heating performance is inadequate.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No. of Inspection Points for Each part

(9)

(10)

8-4-2. Inspection Points for Each Part

(1) Outdoor control circuit board

Refer to "8-3-1. Checking the outdoor unit".

NOTE Do not remove or insert the outdoor control circuit board connector when power is being supplied to it.

(The controller will be damaged.)

(2) Fuse

Check it visually or the continuity with a tester.

(3) Compressor

Check for an open circuit in the compressor coil winding.

(4) Compressor protective sensor (compressor discharge temperature thermistor)

Check that the senseor is securely contained in the thermostart holder.

(5) 4-way valve

Short-circuit the T-RUN terminal to the COM terminal of TEST/T-RUN terminals. Perfrom a test run of the unit alone, and check whether the 4-way valve inside the outdoor unit produces a click sound.

(6) Coil thermistor

Check that the sensor is securely contained in the thermostat holder.

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Panasonic CU-4KE31NBU, CU-4KE24NBU, CU-3KE19NBU service manual Inspection Points for Each Part

CU-3KE19NBU, CU-4KE24NBU, CU-4KE31NBU specifications

The Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are high-efficiency air conditioning units that represent Panasonic's commitment to innovative climate control solutions. These models integrate advanced technologies to deliver superior performance, energy savings, and user comfort, making them ideal for both residential and commercial applications.

The CU-4KE24NBU, a part of the ECOi series, is designed for medium-sized spaces. It boasts an impressive cooling capacity, ensuring optimal temperature regulation. Its inverter technology adjusts the compressor speed according to the needs of the environment, resulting in reduced energy consumption and consistent comfort levels. The unit operates quietly, making it suitable for bedrooms, offices, or other noise-sensitive environments. Additionally, it features a robust air filtration system that improves indoor air quality by removing dust and allergens.

The CU-4KE31NBU offers a slightly higher capacity, making it perfect for larger areas. Like its counterpart, it utilizes inverter technology, which not only enhances energy efficiency but also minimizes wear and tear on the components, leading to a longer lifespan. Its multi-split capability allows for the connection of multiple indoor units to a single outdoor unit, providing flexibility in installation. The CU-4KE31NBU also integrates smart technology that allows users to control the system remotely via smartphones, giving them greater convenience and control over their environment.

For applications requiring a more compact option, the CU-3KE19NBU is an excellent choice. This model balances size and power, offering a competitive cooling capacity that can easily service small to medium-sized rooms. The unit is designed for easy installation and maintenance, featuring a lightweight construction that simplifies handling by technicians. The efficient inverter technology ensures that users benefit from lower energy bills while maintaining a consistent indoor climate.

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In summary, the Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are exemplary air conditioning solutions that combine cutting-edge technology with user-friendly features, ensuring that they meet the varying needs of today's consumers while promoting energy efficiency and sustainability.