Mitsubishi Electric PUHZ-W50VHA Technical Manual page 39

• If the unit cannot be operated properly after test run, refer to the following table to find the cause.
Wired remote controller
PLEASE WAIT
PLEASE WAIT → Error code
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
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 interface controller, refer to the following table.
Display detail A (SW 3-1 = OFF, SW 3-2 = OFF, SW 3-3 = OFF)
LED1 (power for microcomputer)
LED2 (power for remote controller)
LED3 (communication between Interface controller
and outdoor units)
Symptom
LED 1, 2 (PCB in outdoor unit)
For about 2
After LED 1, 2 are lighted, LED 2 is
minutes after
turned off, then only LED 1 is
power-on lighted. (Correct operation)
Only LED 1 is lighted. →
Subsequent to
about 2 minutes
after power-on
Only LED 1 is lighted. →
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 Interface controller which is connected
to the outdoor unit refrigerant addresses "0".
Indicates state of communication between the Interface controller 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 start-up. (Correct operation)
•Connector for the outdoor unit's protection
device is not connected.
LED 1, 2 blink.
•Reverse or open phase wiring for the outdoor
unit's power terminal block (L1, L2, L3)
•Incorrect wiring between interface controller
and outdoor (incorrect polarity of S1, S2, S3)
LED 1 blinks twice,
LED 2 blinks once.
•Remote controller wire short
39
Cause