Mitsumi electronic PLA-A36AA, PLA-A30AA Cause Countermeasure Pipe temperature thermistor

Error Code	Abnormal point and detection method	Cause	Countermeasure
	Pipe temperature thermistor /	1 Defective thermistor	1–3Check resistance value of thermistor.
	Condenser-Evaporator (TH5)	characteristics	For characteristics, refer to (P1) above.
	1 The unit is in 3-minute resume protec-	2 Contact failure of connector	2 Check contact failure of connector (CN29)
	tion mode if short/open of thermistor is	(CN29) on the indoor controller	on the indoor controller board. Refer to 10-7.
	detected. Abnormal if the unit does not	board (Insert failure)	Turn the power on and check restart after
	get back to normal within 3 minutes.	3 Breaking of wire or contact	inserting connector again.
			4 Operate in test run mode and check pipe
	(The unit returns to normal operation, if	failure of thermistor wiring
			<condenser / evaporator> temperature with
	it has been reset normally.)	4 Temperature of thermistor is
			outdoor controller circuit board. If pipe
	2 Constantly detected during cooling, dry-	90:(194˚F) or more or -40:
			<condenser / evaporator> temperature is
	ing, and heating operation (except	(-40˚F) or less caused by	extremely low (in cooling mode) or high (in
	defrosting)	defective refrigerant circuit.	heating mode), refrigerant circuit may have
	Short: 90:(194˚F) or more	5 Defective indoor controller	defect.
P9	Open: -40:(-40˚F) or less	board	5 Operate in test run mode and check pipe
			<condenser / evaporator> temperature with
			outdoor control circuit board. If there is
			exclusive difference with actual pipe
			<condenser / evaporator> temperature
			replace indoor controller board.
			There is no abnormality if none of above
			comes within the unit.
			Turn the power off and on again to operate.
			In case of checking pipe temperature	)
			with outdoor controller circuit board,
			be sure to connect A-control service
			(tool (PAC-SK52ST).
	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 any transmission	as “sub” remote controller. In	if there is no problem with the action above.
	normally from indoor unit of refrigerant	this case, E0 is displayed on	3 Check wiring of remote controller.
			• Total wiring length: max. 500m
	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
E0		circuit of remote controller	When the above-mentioned problem 1~3 are not seen.
	not receive any data from remote con-	5 Defective transmitting receiving	4 Diagnose remote controllers.
or
	troller board or normally from other	circuit of indoor controller board	a) When “RC OK” is displayed,
E4	indoor controller board for 3 minutes.	of refrigerant address “0”	remote controllers have no problem.
			Turn the power off, and on again to
	(Error code: E4)	6 Noise has entered into the
			check. If abnormality generates again,
	2 Indoor controller board cannot receive	transmission wire of remote
			replace indoor controller board.
	any signal from remote controller for 2	controller.
			b) When “RC NG” is displayed,
	minutes. (Error code: E4)		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,
			the indoor controller board of address
			“0” may be abnormal.
	Remote controller transmission	1 2 remote controller are set as	1 Set a remote controller to main, and the
	error(E3)/signal receiving error(E5)	“main.” (In case of 2 remote	other to sub.
	1 Abnormal if remote controller could not	controllers)
	find blank of transmission path for 6 sec-	2 Remote controller is connected	2 Remote controller is connected with only 1
	onds and could not transmit.	with 2 indoor units or more.	indoor unit.
	(Error code: E3)
		3 Repetition of refrigerant	3 The address changes to a separate setting.
	2 Remote controller receives transmitted
	data at the same time, compares the	address
E3	data, and when detecting it, judges	4 Defective transmitting receiving	4~6 Diagnose remote controller.
	different data to be abnormal 30	circuit of remote controller	a) When “RC OK” is displayed, remote con-
or	continuous times. (Error code: E3)	5 Defective transmitting receiving	trollers have no problem.
E5	1 Abnormal if indoor controller board could	circuit of indoor controller board	Turn the power off, and on again to check.
			When becoming abnormal again, replace
		6 Noise has entered into trans-
	not find blank of transmission path.		indoor controller board.
		mission wire of remote controller.
	(Error code: E5)		b)When “RC NG” is displayed, replace
	2 Indoor controller board receives trans-		remote controller.
	mitted data at the same time, compares		c)When “RC E3” or “ERC 00-66” is displayed,
	the data,and when detecting it, judges		noise may be causing abnormality.
	different data to be abnormal 30
	continuous times. (Error code: E5)

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