Mitsubishi Electric PEAD Series Service Manual page 30

TROUBLESHOOTING
If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause.
Wired remote controller
PLEASE WAIT
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
On the IR wireless remote controller with conditions above, following phenomena takes place.
No signals from the remote controller are accepted.
OPE 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)
LED2 (power for remote controller)
LED3 ( communication between indoor and outdoor units)
AUTO RESTART FUNCTION
Indoor controller board
This model is equipped with the AUTO RESTART FUNCTION.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are
memorized by the indoor controller board.
The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart
automatically.
Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1).
HWE16080
Symptom
LED 1, 2 (PCB in outdoor unit)
For about 2
After LED 1, 2 are lighted, LED 2 is
minutes
turned off, then only LED 1 is
following power-
lighted. (Correct operation)
on
After about 2
LED 1, 2 blink.
minutes has
expired
following power-
LED 1, 2 blinks twice, LED 2 blinks
on
once.
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.
For about 2 minutes after power-on, operation of
the remote controller is not possible due to
system start-up. (Correct operation)
Connector for the outdoor unit's protection device
is not connected.
Reverse or open phase wiring for the outdoor
unit's power terminal block (L1, L2, L3)
Incorrect wiring between indoor and outdoor units
(incorrect polarity of S1, S2, S3)
Remote controller wire short
30
Cause