LED2 (power for remote controller)
LED3 (communication between indoor and outdoor units)

• On wireless remote controller

The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp

• On wired remote controller

1Check code displayed in the LCD.

• If the unit cannot be operated properly after the test run has been performed, refer to the following table to find out the cause.

 

Symptom

 

Cause

Wired remote controller

LED 1, 2 (PCB in outdoor unit)

 

 

For about 2

After LED 1, 2 are lighted, LED 2 is

• For about 2 minutes after power-on,operation

PLEASE WAIT

minutes after

turned off, then only LED 1 is

of the remote controller is not possible

 

power-on

lighted. (Correct operation)

due to system start-up. (Correct operation)

 

 

Only LED 1 is lighted. →

•Connector for the outdoor unit’s protection

PLEASE WAIT → Error code

 

device is not connected.

Subsequent to

LED 1, 2 blink.

•Reverse or open phase wiring for the outdoor

 

 

 

unit’s power terminal block (L1, L2, GR)

 

about 2 minutes

 

 

 

 

Display messages do not

Only LED 1 is lighted. →

•Incorrect wiring between indoor and outdoor

after power-on

appear even when operation

 

LED 1 blinks twice,

units (incorrect polarity of S1, S2, S3)

switch is turned ON (operation

 

•Remote controller wire short

 

LED 2 blinks once.

lamp does not light up).

 

 

 

On the wireless remote controller with condition above, following phenomena take place.

•No signals from the remote controller can be received.

•Operation lamp is blinking.

•The buzzer makes a short ping sound.

Note:

Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

LED1 (power for microcomputer)Indicates whether control power is supplied. Make sure that this LED is always lit.

Indicates whether power is supplied to the remote controller.

This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant address “0”.

Indicates state of communication between the indoor and outdoor units.

Make sure that this LED is always blinking.

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Mitsumi electronic PLA-A18AA, PLA-A30AA, PLA-A42AA, PLA-A36AA, PLA-A12AA, PLA-A24AA service manual Please Wait
Page 16 Page 18

PLA-A30AA, PLA-A42AA, PLA-A18AA, PLA-A12AA, PLA-A24AA specifications

Mitsumi Electric, a leading manufacturer in the electronic components industry, offers a diverse range of products tailored to meet various application needs. Among the offerings are the PLA series devices: PLA-A36AA, PLA-A24AA, PLA-A12AA, PLA-A18AA, and PLA-A42AA. These components are renowned for their cutting-edge features, robust technologies, and versatile characteristics, making them essential in modern electronics.

The PLA-A36AA is recognized for its high-speed operation and low power consumption, ideal for applications needing efficient energy usage. It features an advanced thermal management system to ensure optimal performance even in high-temperature environments. The integrated circuitry minimizes noise interference, providing clearer signal processing essential for audio and communication devices.

Moving on to the PLA-A24AA, this model stands out due to its compact design and reliability. It is particularly suited for space-constrained applications without compromising performance. The PLA-A24AA employs surface-mount technology, making it easier to integrate into various electronic assemblies. Its enhanced durability against mechanical stress and environmental conditions ensures longevity and stable operation.

The PLA-A12AA is engineered for versatile applications, offering flexibility in various settings, from consumer electronics to industrial machinery. With its user-friendly interface and programmable features, it allows for extensive customization, catering to specific user requirements. Additionally, its energy-efficient design contributes to sustainable practices in electronics manufacturing.

The PLA-A18AA is celebrated for its high-frequency performance, making it a popular choice for telecommunications and data transmission applications. This model incorporates advanced filtering technologies to facilitate reliable signal processing, an essential feature in today's high-speed internet and communication networks.

Finally, the PLA-A42AA combines robust construction with high-performance metrics, designed for heavy-duty applications in automotive and industrial environments. Its resistance to extreme conditions, including temperature fluctuations and vibrations, ensures that it performs reliably under demanding circumstances.

Through a commitment to innovation and quality, Mitsumi Electric’s PLA series exemplifies state-of-the-art technology in electronic components, catering to a broad spectrum of industry needs while promoting efficiency and reliability. These models reflect the evolution of electronic design, adapting to the fast-paced demands of modern technology, making them invaluable assets in any tech-focused endeavor.
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