Mitsubishi Electronics PUZ-A18NHA2, PUZ-A30NHA2 Case Judgment and action Low pressure 63L worked

Error Code	Abnormal point and detection method	Case	Judgment and action
	Low pressure (63L worked)	1 Stop valve of outdoor unit is	1 Check stop valve.
	Abnormal if 63L is worked (under-	closed during operation.
	0.03MPa) during compressor operation.	2 Disconnection or loose connection 2~4 Turn the power off and on again to check
	63L: Low-pressure switch	of connector (63L) on outdoor	if F3 is displayed on restarting.
UL		controller board	If F3 is displayed, follow the F3 processing
	(A42N only)	3 Disconnection or loose	direction.
(1300)
		connection of 63L
		4 Defective outdoor controller board
		5 Leakage or shortage of refrigerant	5 Correct to proper amount of refrigerant.
		6 Malfunction of linear expansion	6 Check linear expansion valve.
		valve	Refer to 10-6.
	Compressor overcurrent interruption	1 Stop valve of outdoor unit is	1 Open stop valve.
	Abnormal if overcurrent DC bus or com-	closed.
	pressor is detected after compressor starts	2 Decrease of power supply volt-	2 Check facility of power supply.
	operating for 30 seconds.	age
		3 Looseness, disconnection or	3 Correct the wiring (U·V·W phase) to
		converse of compressor wiring	compressor. Refer to 10-9 (Outdoor power
		connection	circuit board).
		4 Defective fan of indoor/outdoor	4 Check indoor/outdoor fan.
		units	5 Solve short cycle.
UP		5 Short cycle of indoor/outdoor	6 Replace outdoor controller circuit board.
		units	7 Check compressor.
(4210)		6 Defective input circuit of out-	Refer to 10-6.
		door controller board	W Before the replacement of the outdoor
		7 Defective compressor	controller circuit board, disconnect the wiring
			to compressor from the outdoor power circuit
			board and check the output voltage among
			phases, U, V, W, during test run. No defect
			on board if voltage among phases (U-V, V-W
			and W-U) is same. Make sure to perform the
			voltage check with same performing frequency.
	Remote controller transmission	1 Contact failure at transmission 1 Check disconnection or looseness of indoor
	error(E0)/signal receiving error(E4)	wire of remote controller	unit or transmission wire of remote controller.
	1 Abnormal if main or sub remote con-	2 All remote controllers are set	2 Set one of the remote controllers “main”.
	troller cannot receive normally any trans-	as “sub” remote controller. In	If there is no problem with the action above.
			3 Check wiring of remote controller.
	mission from indoor unit of refrigerant	this case, E0 is displayed on
			• Total wiring length: max. 500m[1640ft]
	address “0” for 3 minutes.	remote controller, and E4 is
			(Do not use cable o 3 or more.)
	(Error code : E0)	displayed at LED (LED1, LED2)
			• The number of connecting indoor units:
	2 Abnormal if sub-remote controller could	on the outdoor controller circuit
			max. 16 units
	not receive for any signal for 2 minutes.	board.
			• The number of connecting remote con-
	(Error code: E0)	3 Miswiring of remote controller
			troller: max. 2 units
	1 Abnormal if indoor controller board can	4 Defective transmitting receiving
		circuit of remote controller	When the above-mentioned problem of 1~3
E0	not receive any data normally from	5 Defective transmitting receiving	are not applied
	remote controller board or from other	circuit of indoor controller board	4 Diagnose remote controllers.
or
	indoor controller board for 3 minutes.	of refrigerant address “0”.	a) When “RC OK” is displayed,
E4
	(Error code: E4)	6 Noise has entered into the	remote controllers have no problem.
			Turn the power off, and on again to
	2 Indoor controller board cannot receive	transmission wire of remote
			check. If abnormality generates again,
	any signal from remote controller for 2	controller.
			replace indoor controller board.
	minutes. (Error code: E4)
			b) When “RC NG” is displayed,
			replace remote controller.
			c) When “RC E3” is displayed,
			d) When “ERC 00-06” is displayed,
			[ c),d)→Noise may be causing abnormality. ]
			∗ If the unit is not normal after replacing
			indoor controller board in group control,
			indoor controller board of address “0”
			may be abnormal.
	Remote controller control board	1 Defective remote controller	1 Replace remote controller.

1Abnormal if data cannot be normally read from the nonvolatile memory of the

E1	remote controller control board.
	(Error code: E1)
or
E2	2 Abnormal if the clock function of remote
	controller cannot be normally operated.
	(Error code: E2)

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