Toshiba MMU-AP0181MH, MMU-AP0151MH Diagnosis Procedure for Each Check Code, E03, E04, E02

7-5. Diagnosis Procedure for Each Check Code

Check code	Check code name		Cause of operation
[E01]	Communication error between	1. Remote controller inter-unit cable error
	indoor and remote controller	2. Indoor power error
	(Detected at remote controller side)	3.	Indoor P.C. board error
		4.	Remote controller address setup error
		5.	Remote controller P.C. board error

Check code	Check code name	Cause of operation
[E03]	Communication error between	No communication from remote controller and
	indoor and remote controller	communication adaptor
	(Detected at indoor side)

This error is detected when the indoor unit cannot receive a signal from the remote controller. Check communication wires of the remote controllers A and B.

As communication is impossible, this check code [E03] is not displayed on the main remote controller. It is displayed on TCC-LINK central controller.

Is the inter-unit cable of		NO
remote controllers (A/B) normal?
	YES
Is there no disconnection or		YES
connector contact error on harness out
of terminal block of indoor unit?
	NO

NO

Is a group control operation?

YES

Correct inter-unit cable of remote controller.

Correct connector connection and check circuit cabling.

Check code	Check code name		Cause of operation
[E04]	Indoor/Outdoor	1.	Power of outdoor unit was firstly turned on.
	communication circuit error	2.	Connection error of communication line
	(Detected at indoor side)		between indoor and outdoor
		3.	End terminal resistance setup error on
			communication between indoor and outdoor
		4.	Address setup error

Is power of each indoor unit turned on?

NO

Check power connection status of indoor unit. (Turn on power again.)

Was power turned on in order	NO
of indoor unit outdoor unit?

Turn on power again in order of indoor unit outdoor unit.

65

	YES
		NO
Is power applied to remote controller?
AB terminals: Approx. DC18V
	YES
Is setup of two remote controllers		YES
without main remote controller?
	NO

Check indoor P.C. board.

Defect Replace

Change one to main/other to sub.

(Remote controller address connector)

	YES
		NO
Is connection (U1/U2 terminals) of
indoor/outdoor inter-unit wire normal?
	YES
Is connector connection from		NO
U1/U2 terminals of indoor/outdoor
inter-unit wire normal?

Correct inter-unit wire.

Correct connector connection.

Check remote controller P.C. board.

YES

Defect Replace

Is the end terminal resistance		NO
setup of outdoor unit normal?
	YES
		NO

Correct the end terminal resistance setup.

Check code Check code name Cause of operation

[E02]	Remote controller sending error Signal could not be sent to indoor unit.
	Check the communication wire of the remote
	controller.

* It is not displayed on 7-segment display of the central control controller.

Is address setup correct?
	YES
		NO
Is power applied to fuse (F03)
on indoor P.C. board?
	YES

Set up address again.

Check connection of inter-unit wire between indoor and outdoor is correct, and then connect communication line connector on indoor P.C. board (CN40) to CN44 (EMG).

Is communication cabling between		NO
remote controller and indoor unit correct?
	YES
Sending circuit error
inside of the remote controller
Replace remote controller.

Correct the communication cabling.

YES

Is there no noise, etc?

NO

Check indoor P.C. board.

Defect Replace

Check noise, etc, and eliminate it if any.

For details, refer to “Troubleshooting in test operation”.