Test run – MITSUBISHI ELECTRIC Mr. Slim PKA-A-GA User Manual

Page 14

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

Symptom

Cause

Wired remote controller

LED 1, 2 (PCB in outdoor unit)

PLEASE WAIT

→ Error code

Display messages do not appear even
when operation switch is turned ON
(operation lamp does not light up).

For about 2
minutes following
power-on

After about 2
minutes has
expired following
power-on

After LED 1, 2 are lighted, LED 2 is turned off,
then only LED 1 is lighted. (Correct operation)

Only LED 1 is lighted.

→ LED 1, 2 blink.

Only LED 1 is lighted.

→ LED 1 blinks twice,

LED 2 blinks once.

• For about 2 minutes following power-on, operation of the

remote controller is not possible due to system start-up. (Cor-
rect operation)

• Connector for the outdoor unit’s protection device is not con-

nected.

• Reverse or open phase wiring for the outdoor unit’s power

terminal block (L1, L2, GR)

• Incorrect wiring between indoor and outdoor units (incorrect

polarity of S1, S2, S3)

• Remote controller wire short

On the wireless remote controller with condition above, following phenomena takes place.
• No signals from the remote controller are accepted.
• OPE lamp is blinking.
• The buzzer makes a short pipng sound.

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

For description of each LED (LED 1, 2, 3) provided on the indoor controller, refer to the following table.

LED 1 (power for microcomputer)

Indicates whether control power is supplied. Make sure that this LED is always lit.

LED 2 (power for remote controller)

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”.

LED 3 (communication between indoor and outdoor units only A-control) Indicates state of communication between the indoor and outdoor units. Make sure that this LED is

always blinking.

7. Test run

• On wireless remote controller

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

• On wired remote controller

Check code displayed in the LCD.

[Output pattern B]

Errors detected by unit other than indoor unit (outdoor unit, etc.)

Beeper sounds/OPERATION

Symptom

Remark

INDICATOR lamp flashes

Check code

(Number of times)

Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)

Compressor overcurrent interruption

U3, U4

Open/short of outdoor unit thermistors

Compressor overcurrent interruption (When compressor locked)

Abnormal high discharging temperature/49C worked/insufficient refrigerant

U1, Ud

Abnormal high pressure (63H worked)/Overheating safeguard operation

Abnormal temperature of heat sink

Outdoor unit fan safeguard stop

Compressor overcurrent interruption/Abnormal of power module

Abnormality of super heat due to low discharge temperature

U9, UH

Abnormality such as overvoltage or voltage shortage and abnormal synchronous
signal to main circuit/Current sensor error

–

Others

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

*1 If the beeper does not sound again after the initial two 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 three times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial two beeps to confirm the self-check start signal was received, the

specified refrigerant address is incorrect.

For details, check the LED display
of the outdoor controller board.

Wireless remote controller

Wired remote

controller

BG79U874H01_en

05.11.30, 9:24