Refer to the following tables for details on the check codes. [Output pattern A]

Beeper sounds Beep

 

 

Beep

Beep

Beep

Beep

 

 

Beep

Beep

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPERATION

 

 

 

 

 

 

 

1st

 

2nd

 

 

3rd

 

 

nth

 

 

 

 

 

1st

 

 

2nd · · · Repeated

INDICATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lamp blink

 

 

 

 

Off

 

 

On

On

 

On

 

On

Off

 

 

On

 

On

pattern

Self-checkApprox. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.

0.5 sec. Approx. 2.5 sec. 0.5 sec.

 

0.5 sec.

 

starts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Start signal

Number of blinks/beeps in pattern indicates the check

Number of blinks/beeps in pattern indicates

 

received)

 

code in the following table (i.e., n=5 for “P5”)

 

the check code in the following table

 

 

 

 

 

 

[Output pattern B]

Beeper sounds Beep

 

 

 

 

OPERATION

 

 

 

 

 

 

 

 

INDICATOR

 

 

 

 

 

 

 

 

lamp blink

 

 

 

 

 

 

 

 

 

 

 

 

Off

 

 

pattern

Self-check

Approx. 2.5 sec.

 

 

starts (Start signal received)

 

 

Beep

Beep

Beep

 

Beep

 

 

 

 

 

 

Beep

Beep

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1st

 

 

2nd

 

 

3rd

 

 

 

nth

 

 

 

 

 

 

 

 

 

1st

 

2nd · · · Repeated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

On

 

 

On

 

On

 

On

 

 

On

 

Off

 

On

 

On

On

Approx. 3 sec.

 

0.5 sec. 0.5 sec. 0.5 sec.

 

0.5 sec.

Approx. 2.5 sec.

 

Approx. 3 sec.

0.5 sec.

0.5 sec.

Number of blinks/beeps in pattern indicates the check

 

Number of blinks/beeps in pattern indicates

code in the following table (i.e., n=5 for “U2”)

 

the check code in the following table

[Output pattern A] Errors detected by indoor unit

IR wireless remote controller

Wired remote controller

 

 

 

 

Beeper sounds/OPERATION

 

Symptom

Remark

INDICATOR lamp blinks

Check code

 

 

 

 

(Number of times)

 

 

 

 

 

1

P1

Intake sensor error

 

 

 

2

P2

Pipe (TH2) sensor error

 

 

 

P9

Pipe (TH5) sensor error

 

 

 

 

 

 

 

3

E6,E7

Indoor/outdoor unit communication error

 

 

 

4

P4

Float switch connector (CN4F) open

 

 

 

5

P5

Drain pump error

 

 

 

PA

Forced compressor stop(due to water leakage abnormality)

 

 

 

 

 

 

 

 

 

 

6

P6

Freezing/Overheating protection operation

 

 

 

7

EE

Communication error between indoor and outdoor units

 

 

 

8

P8

Pipe temperature error

 

 

 

9

E4, E5

Remote controller signal receiving error

 

 

 

10

 

 

 

11

 

 

 

12

Fb

Indoor unit control system error (memory error, etc.)

 

 

 

E0, E3

Remote controller transmission error

 

 

 

E1, E2

Remote controller control board error

 

 

 

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)

IR wireless remote controller

Wired remote controller

 

 

Beeper sounds/OPERATION

 

Symptom

Remark

INDICATOR lamp blinks

Check code

 

 

(Number of times)

 

 

 

1

E9

Indoor/outdoor unit communication error

 

(Transmitting error) (Outdoor unit)

 

 

 

 

2

UP

Compressor overcurrent interruption

 

3

U3,U4

Open/short of outdoor unit thermistors

For details, check

4

UF

Compressor overcurrent interruption (When compressor locked)

the LED display

 

 

Abnormal high discharging temperature/49C operated/

5

U2

of the outdoor

insufficient refrigerant

 

 

controller board.

 

 

Abnormal high pressure (63H operated)/Overheating

6

U1,Ud

As for outdoor

protection operation

 

 

unit, refer to

7

U5

Abnormal temperature of heatsink

outdoor unit's

8

U8

Outdoor unit fan protection stop

service manual.

9

U6

Compressor overcurrent interruption/Abnormal of power module

 

10

U7

Abnormality of superheat due to low discharge temperature

 

11

U9,UH

Abnormality such as overvoltage or voltage shortage and

 

abnormal synchronous signal to main circuit/Current sensor error

 

 

 

 

12

 

13

 

14

Others

Other errors (Refer to the technical manual for the outdoor unit.)

 

*1 If the beeper does not sound again after the initial 2 beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp does not come on, there are no error records.

*2 If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to confirm the self-check start signal was received, the specified refrigerant address is incorrect.

14

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Mitsubishi Electronics PKA-A30KA4.TH, PKA-A36KA4.TH, PKA-A24KA4.TH service manual U9,UH

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.