Mitsubishi Electronics PUZ-A42NHA2-BS, PUZ-A30NHA2 Case Judgment and action Outdoor fan motor

Error Code	Abnormal point and detection method	Case	Judgment and action
	Outdoor fan motor	1 Failure in the operation of	1 Check or replace the DC fan motor.
	The outdoor fan motor is considered to be	the DC fan motor
	abnormal if the rotational frequency of fan	2 Failure in the outdoor circuit	2 Check the voltage of the outdoor circuit
	motor is abnormal when detected during	controller board	controller board during operation.
	operation.		3 Replace the outdoor circuit controller
	Fan motor rotational frequency is abnormal		board. (when the failure is still indicated
U8	if;		even after performing the remedy 1
	• 100 rpm or below detected continuously		above.)
(4400)
	for 15 seconds at 20:[68˚F] or more
	outside air temperature
	• 50 rpm or below or 1500 rpm or more
	detected continuously for 1 minute.
	Overvoltage or voltage shortage and	1 Decrease of power supply volt- 1 Check the facility of power supply.
	synchronous signal to main circuit	age	2 Correct the wiring (U·V·W phase) to com-
	Abnormal if any of followings are detected	2 Disconnection of compressor	pressor. Refer to 10-9 (Outdoor power circuit
		wiring	board).
	during compressor operation;	3 Disconnection or loose con-	3 Check CN52C wiring.
	• Decrease of DC bus voltage to 310V	nection of CN52C
	• Instantaneous decrease of DC bus volt-	4 Defective PFC module of out- 4 Replace outdoor power circuit board.
	age to 200V	door power board (A12, 18,	(A12, 18, 24N only)
	• Increase of DC bus voltage to	24N only)
	A12, 18, 24N : 420V	5 Defective ACT module (A30,	5 Replace ACT module. (A30, 36, 42N only)
	A30, 36, 42N : 400V	36, 42N only)
	• Decrease of input current of outdoor unit	6 Defective ACT module drive	6 Replace outdoor power circuit board.
	to 0.5A only if operation frequency is	circuit of outdoor power circuit	(A30, 36, 42N only)
	more than or equal to 40Hz or compres-	board (A30, 36, 42N only)
	sor	7 Disconnection or loose con-	7 Check CNAF wiring. (A30, 36, 42N only)
U9	current is more than or equal to 5A.	nection of CNAF (A30, 36, 42N
	• Abnormal power synchronous (zero	only)
(4220)
	cross) signal	8 Defective 52C drive circuit of	8 Replace outdoor noise filter circuit board.
	• PFC error (overcurrent) when the current	outdoor noise filter circuit
	peak of input current increase A12, 18,	board
	24N: 47A (peak)	9 Disconnection or loose	9 Check CN5 wiring on the outdoor power
		connection of CN5 on the	circuit board.
		outdoor power circuit board	Refer to 10-9.
		0 Disconnection or loose	0 Check CN2 wiring on the outdoor power
		connection of CN2 on the	circuit board.
		outdoor power circuit board	Refer to 10-9.

	Compressor overcurrent interruption	1 Stop valve is closed.	1 Open stop valve.
	(When compressor locked)	2 Decrease of power supply	2 Check facility of power supply.
	Abnormal if overcurrent of DC bus or	voltage
	compressor is detected within 30 seconds	3 Looseness, disconnection or	3 Correct the wiring (U·V·W phase) to
UF	after compressor starts operating.	converse of compressor wiring	compressor.
(4100)		connection	Refer to 10-9 (Outdoor power circuit board).
		4 Defective compressor	4 Check compressor.
			Refer to 10-6.
		5 Defective outdoor power board 5 Replace outdoor power circuit board.
	Current sensor error	1 Disconnection of compressor	1 Correct the wiring (U·V·W phase) to
	• Abnormal if current sensor detects –1.5A	wiring	compressor. Refer to 10-9 (Outdoor power
	to 1.5A during compressor operation.		circuit board).
	(This error is ignored in case of test run	2 Defective circuit of current	2 Replace outdoor power circuit board.
	mode.)	sensor on outdoor power
UH	w This error is ignored in case of test run	circuit board
(5300)	mode.	3 Decrease of power supply	3 Check the facility of power supply.
	• It’s abnormal for 38A the input current or	voltage
	10 seconds continuous 34A or more.

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