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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Mitsumi electronic PKA-A12HA4, PKA-A18HA4 service manual U9,UH

PKA-A18HA4, PKA-A12HA4 specifications

Mitsumi Electric Company is known for its innovations in the electronic components sector, and among its noteworthy products are the PKA-A18HA4 and PKA-A12HA4 components. Both models represent advancements in their respective categories, characterized by reliability, high performance, and cutting-edge technology.

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