Toshiba MMU-AP0091H service manual 141, E16, E18 / 97/99, E19, Reference

Check code	Check code name		Cause of operation
[E16] / [89]	Connected indoor units	1.	There are 48 or more connected indoor units.
(TCC-L / AI-NET)	capacity over	2.	Capacity over of total connected indoor units.
		3.	Incorrect setup of indoor/outdoor capacity
Sub-code:00 : Capacity over	01 : ~ : Number of connected indoor units

Check code		Check code name			Cause of operation
[E18] / [97/99]	Communication error between			Regular communication between indoor header
(TCC-L / AI-NET)	indoor header and follower			and follower is unavailable.
Are remote controller			NO
					Correct remote controller
interconnection wires (A/B) normal?					interconnection wires.

YES

YES

Is backup operation of outdoor unit being set up?

	NO
		NO
Is No. of connected indoor units correct?
	YES
		NO
Is setup of indoor unit HP correct?
	YES
		NO
Is total capacity of connected
indoor units within 135%? (*1)
	YES

Perform setup of no detection

for over capacity.

Excessive indoor units are connected.

Correct miswiring.

Correct HP setup.

Ensure capacity of connected

indoor units within 135% of outdoor units.

Is there any disconnection of

connector or wiring from terminal block

of indoor unit?

NO

NO

Is a group control operation?

YES

Is the power of

all indoor units turned on?

YES

Check indoor address.

YES

NO

Correct connection.

Check circuit wire.

Check power connection status

of indoor unit.

Check indoor P.C. board.

Failure ÆReplace

141

For a service P.C. board, check outdoor HP setup.		OK
(Set up jumper 9, 10, 11, and 12.)
	NG

Check outdoor interface P.C. board.

Set up outdoor HP.

(Refer “How to exchange interface P.C. board”.)

(∗ 1) When capacity of the outdoor unit is 12HP, up to a maximum capacity 120% of indoor units can be connected.

Correct indoor address.

Check code Check code name Cause of operation

	[E19] / [96]	Header outdoor units quantity error 1. Misconnection of interconnection cable
(TCC-L / AI-NET)					between indoor and outdoor
					2. Outdoor I/F P.C. board error
Sub-code:00: No header unit 02: Two or more header units
	Are communication lines (U1, U2)		YES
					Connect communication line between indoor
between indoor and outdoor connected
					and outdoor to one unit per 1 system.
	to multiple outdoor units?
		NO
			NO
Is communication line between indoor and					Connect communication line between indoor
outdoor connected to one unit per 1 system?					and outdoor.
		YES
				Reference)
	Check I/F P.C. board.
				When the power supply of the outdoor unit is first turned
				on, the check code [E19 00] is displayed until the power
				supply of the indoor units are turned on. However is not
				an error. When the power supply of the indoor units are
				this turned on, the check code is automatically reset.