Mitsubishi Electric PLA-A12BA4 Installation Manual page 12

7. Test run
• 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
PLEASE WAIT Error code
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 condition above, following phenomena take place.
• No signals from the remote controller are accepted.
• Operation 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.
LED 1 (power for microcomputer)
LED 2 (power for remote controller)
LED 3 (communication between indoor and outdoor units)
12
Symptom
LED 1, 2 (PCB in outdoor unit
After LED 1, 2 are lighted, LED 2 is turned
For about 2 minutes
off, then only LED 1 is lighted. (Correct
after power-on
operation)
Only LED 1 is lighted.
Subsequent to about
2 minutes after power-
on
Only LED 1 is lighted.
twice, LED 2 blinks 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.
Water supply pump
Water (about 1000cc, 1/4 gal)
Drain plug
Pour water through outlet
. Be carefule not to spray water
into the drain pump mechanism.
•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.
LED 1, 2 blink.
•Reverse or open phase wiring for the outdoor unit's power
terminal block (L1, L2, GR)
•Incorrect wiring between indoor and outdoor units (incorrect
LED 1 blinks
polarity of S1, S2, S3)
•Remote controller wire short
7.4. Check of drainage (Fig. 7-5)
• Ensure that the water is being properly drained out and that no water is leaking
from joints.
When electric work is completed.
.
Pour water during cooling operation and check.
When electric work is not completed.
.
Pour water during emergency operation and check.
* Drain pan and fan are activated simultaneously when single phase 220-240V is
turned on to S1 and S2 on terminal block after the connecter (SWE) on controller
board in the electrical branch box is set to ON.
Be sure to turn it back to the former state after work.
Cause