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Mitsubishi Electric Mr.Slim PKA-M35HA Service Manual Page 21

Split-type, heat pump air conditioners.
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• If the unit cannot be operated properly after test run, refer to the following table to find the cause.
Wired remote controller
PLEASE WAIT → Check code
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
On the wireless remote controller with conditions 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.
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)
LED2 (power for remote controller)
LED3 (communication between indoor and
outdoor units)
LED 1, 2 (PCB in outdoor unit)
For about 2
After LED 1, 2 are lit, LED 2 is
turned off, then only LED 1 is lit.
minutes after
(Correct operation)
Only LED 1 is lit. →
Subsequent to
about 2 minutes
Only LED 1 is lit. →
after power-on
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 addresses "0".
Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.
•For about 2 minutes following power-on,op-
eration of the remote controller is not possible
due to system startup. (Correct operation)
•Connector for the outdoor unit's protection
device is not connected.
•Reverse or open phase wiring for the outdoor
LED 1, 2 blink.
unit's power terminal block (L1, L2, L3)
•Incorrect wiring between indoor and outdoor
units (incorrect polarity of S1, S2, S3)
LED 1 blinks twice,
•Remote controller wire short
LED 2 blinks once.


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