Toshiba MMU-AP0091H Troubleshooting in Test Operation, Check code, Cause Countermeasures

8-5. Troubleshooting in Test Operation

If the phenomena appear, such as a check code is output or the remote controller is not accepted in power-ON after cabling work or in address setup operation, the following causes are considered.

8-5-1. A check Code is Displayed on the Remote Controller

Check code	Outdoor unit
displayed on	7-segment	Cause			Countermeasures
remote controller	display
E04	E19-00	Outdoor power is formerly turned on.			Turn on the power again.
					(In order of Indoor → Outdoor)
		There is none of outdoor terminator resistor, or there			Check SW30 bit 2 of the outdoor unit.
		are two or more resistances.			No connection between multiple refrigerant lines:
		(After address setup)
					SW30 bit 20N
					Connection between multiple refrigerant lines:
					SW30 bit 2 of the connected outdoor unit is turned
					on only in one line.
			ON	2
		After address was decided, all the	1		Check and modifies disconnection of indoor/outdoor
		indoor units do not correctly response			communication line.(Communication line between
		after power-ON in outdoor unit.			outdoor unit and the leading indoor unit)
					Check influence of communication noise.
			SW30
	L08	Address setup error			Set up address again.
		• Only line addresses of the connected indoor units
		are undefined.
		• The outdoor line address and the line addresses in
		all indoor units do not match.
		• The indoor addresses are duplicated.
		(Units except those displaying E04 are duplicated.)
		• A header unit is not set up in a group.
		(Except group displaying E04)
	E08-XX	Duplication of indoor addresses.			Set up address again.
		(Address No in which sub-code of the check code
		are duplicated)
	E07	There is none of outdoor terminal			Check SW30 bit 2 of the outdoor unit.
		resistance, or there are two or more	ON	2	No connection between multiple refrigerant lines:
			1
		resistances.
					SW30 bit 20N
		(After address setup, when terminal
					Connection between multiple refrigerant lines:
		resistance setup is changed after
					SW30 bit 2 of the connected outdoor unit is turned
		power-ON.)	SW30		on only in one line.
		Transmission circuit error at interface side			Replace the interface P.C. board.
		(P.C. board failure)
	E06	After address setup, communication from all the			Check and correct disconnection of indoor/outdoor
		indoor units interrupted under condition that a			communication line.(Communication line between
		normal operation can be performed.			outdoor unit and the leading indoor unit)
					Check influence of communication noise.
E16	E16-XX	Exceeded No of connected indoor units or			Adjust No of connected indoor units or capacity.
		exceeded capacity.
E25	E25	Duplication of outdoor addresses.			Do not use a manual setup for outdoor address.
		(Only when outdoor address was manually set up)
L04	L04	Duplication of outdoor line addresses			Modify line address setup of the outdoor unit
		• Line address setup error, occurred after connec-			between lines. (Set up SW 13 and 14 on the
					interface P.C. board.)
		tion between U1, U2 and U3, U4 connectors
L05 (∗ )	L06	Duplicated of indoor units with priority			The Heat Recovery Multi is not set up on priority.
L06 (∗ )		There are two or more indoor units set up with
		priority.
L08	L08	Address setup error			Set up address again.
		• Only indoor addresses of all the connected indoor
		units are undefined.

(∗ ) [L05]: Displayed on the indoor unit set up with priority

[L06]: Displayed on the indoor unit except one set up with priority

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