Toshiba MMU-AP0091H Remote Segment, Status Cause Countermeasures, Display, Controller status

8-5-2.Operation from remote controller is not accepted and a check code is dis- played on 7-segment display of the interface P.C. board of the outdoor unit.

Remote	7-segment
	display of	Cause		Countermeasures
controller status
	outdoor unit
No response	L08	Line addresses and indoor addresses of all the connected		Set up addresses.
		indoor units are unset.
		There is no outdoor unit of group control.		Set up group address.
	E19-00	Indoor unit power is not turned on.		Turn on the power again.
				(In order of indoor →	outdoor)
		Indoor/outdoor communication line is not correctly connected		Correct wiring.
		to the outdoor unit. (Fig. 1)
		(Indoor/outdoor cannot communicate before address setup.)
		There is none of outdoor terminator resistor,		Check SW30 bit 2 of the outdoor unit.
		or there are two or more resistances.	ON	No connection between multiple refrigerant lines:
			1 2
		(Before address setup)		SW30 bit 2 0N
				Connection between multiple refrigerant lines:
				SW30 bit 2 of the connected outdoor unit is
			SW30	turned on only in one line.
	E20-01	Address setup is performed with connecting indoor/outdoor		Correct wiring.
		communication line between outdoor units. (Fig. 3)
		Address setup is performed under condition of connecting		Correct wiring.
		between multiple refrigerant lines. (Fig. 3)

8-5-3.There is no display of a check code on 7-segment display on the interface P.C. board of the outdoor unit though there is indoor unit which does not accept the operation from the remote controller.

Remote	7-segment
	display of	Cause	Countermeasures
controller status
	outdoor unit
No response	None	Communication line is not connected between indoor and	Modify wiring.
		outdoor.
		Line and indoor addresses are unset.	Set up address.
		(Unit which does not response to remote controller)
		The power of the header unit of the group is not turned on in	Turn on the power.
		indoor group control.
		(Unit which does not response to remote controller)
		Group address is set up to follower unit in the individual	Set [0] to group address in case of individual
		control. (Unit which does not response to remote controller)	control.
No display on	None	The power is not turned on.	Turn on the power.
remote controller		(Unit which is not displayed on remote controller)
(No line is output.)
		Remote controller is not connected with cable.	Correct wiring.
		(Unit which is not displayed on remote controller)
		Miscabling of remote controller	Correct wiring.
		(Unit which is not displayed on remote controller)
		Remote controller communication circuit error	Remove FASTON terminal connected to remote
		(Unit which is not displayed on remote controller)	controller terminals (A/B), and check the voltage.
		If 230V is incorrectly applied to the remote controller terminal,	If voltage is not applied, replace P.C. board.
		the remote controller communication circuit fails.	(15 to 18V usually)

8-5-4.In check for No. of connected outdoor units and connected Indoor units after address setup, diminished No. of connected units displayed. (There are outdoor/indoor units which do not operate in a test operation.)

Status	Cause	Countermeasures
Number of	Miswiring of communication line between	After modification of wiring, set up address again and check No. of the
connected outdoor	outdoor units or unconnected cable (Fig. 4)	connected outdoor units.
units is short.	(Address setup operation has finished
	without recognition of miswired follower unit.)
Number of	Miswiring of communication line between	After modification of wiring, set up address again and check No. of the
connected indoor	indoor units or unconnected cable (Fig. 5)	connected indoor units.
units is short.	(Address setup operation has finished
	without recognition of miswired indoor unit.)
Number of outdoor	Remote controller is not connected with wire.	Using the main remote controller connected to a group, start a test operation,
units connected to	Miscabling of remote controller	specify the unit which does not operate (Unit unconnected to group), and then
group is short in		check wiring.
group operation
	Remote controller communication circuit	Using the main remote controller connected to a group, start a test operation,
from remote
	error	specify the unit which does not operate (Unit unconnected to group).
controller.
	If 230V is incorrectly applied to the remote	Remove Fasten receptacle connected to remote controller terminals (A/B),
	controller terminal, the remote controller	and check the voltage. If voltage is not applied, replace P.C. board.
	communication circuit fails.	(15 to18V in normal time)

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