Mitsubishi Electronics PLA-A-AA installation manual Check of drainage Fig

7. Test run

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)

Wireless remote controller	Wired remote
	controller
Beeper sounds/OPERATION		Symptom	Remark
INDICATOR lamp flashes	Check code
(Number of times)
1	E9	Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
2	UP	Compressor overcurrent interruption
3	U3, U4	Open/short of outdoor unit thermistors
4	UF	Compressor overcurrent interruption (When compressor locked)
5	U2	Abnormal high discharging temperature/49C worked/insufficient refrigerant
6	U1, Ud	Abnormal high pressure (63H worked)/Overheating safeguard operation
7	U5	Abnormal temperature of heat sink	For details, check the LED display
8	U8	Outdoor unit fan safeguard stop
			of the outdoor controller board.
9	U6	Compressor overcurrent interruption/Abnormal of power module
10	U7	Abnormality of super heat due to low discharge temperature
11	U9, UH	Abnormality such as overvoltage or voltage shortage and abnormal synchronous
		signal to main circuit/Current sensor error
12	–	–
13	–	–
14	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.

•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.

•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)
	For about 2	After LED 1, 2 are lighted, LED 2 is turned off,	• For about 2 minutes following power-on, operation of the
PLEASE WAIT	minutes following		remote controller is not possible due to system start-up. (Cor-
		then only LED 1 is lighted. (Correct operation)
	power-on		rect operation)
			• Connector for the outdoor unit’s protection device is not con-
PLEASE WAIT → Error code		Only LED 1 is lighted. → LED 1, 2 blink.	nected.
	After about 2		• Reverse or open phase wiring for the outdoor unit’s power
	minutes has		terminal block (L1, L2, GR)
Display messages do not appear even	expired following		• Incorrect wiring between indoor and outdoor units (incorrect
	power-on	Only LED 1 is lighted. → LED 1 blinks twice,
			polarity of S1, S2, S3)
when operation switch is turned ON		LED 2 blinks once.
(operation lamp does not light up).			• 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 (LED1, 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	Indicates state of communication between the indoor and outdoor units. Make sure that this LED is
A-control)		always blinking.

A

B

	A Insert the pump end 3 to 5 cm,
C	1-3/16 to 2 inch

B Cover of water supply inlet

D C About 1000 cc, 1/4 gal

ED Water

E Drain plug

Fig. 7-5

7.4. Check of drainage (Fig. 7-5)

•During the test run, ensure the water is being properly drained out and that no water is leaking from joints.

•Always check this during installation even if the unit is not required to provide cool- ing/drying at that time.

•Similarly, check the drainage before finishing ceiling installation in a new premises.

(1) Remove the cover of the water supply inlet and add about 1000 cc, 1/4 gal of water using a water supply pump etc. During this process, be careful not to spray water into the drain pump mechanism.

(2) Confirm that water is being drained out through the drainage outlet, after switch- ing over from remote control mode to test run mode.

(3) After checking the drainage, ensure that the cover is replaced and the power supply is isolated.

(4) After confirming the drainage system is functioning, replace the drain plug.

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