8-4. Trouble Diagnosis of Each Part

8-4-1. Problems of Each Part and Inspection Points

For details about the inspection points, refer to the Inspection Points for Each Part.

Problems

Inspection

points

Self-Diagnostics check

 

Indoor controller

 

(control unit)

 

Indoor fan motor

unit

Room temperature

sensor

Indoor

Heat exchanger

temperature sensor

 

 

Inter-unit cable

 

Switch circuit board

 

Outdoor control circuit

 

board

 

Diode module

 

HIC

 

Electrolytic capacitor

 

Fuse

unit

Compressor

Outdoor

Compressor protective

 

sensor

 

Outdoor fan motor

 

4-way valve

 

Coil thermistor

 

Electric expansion valve

 

Branch tubing

 

temperature sensor

 

 

 

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

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

83

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Panasonic CU-3KE19NBU, CU-4KE31NBU, CU-4KE24NBU Trouble Diagnosis of Each Part, Problems of Each Part and Inspection Points

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.

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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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