Toshiba MMU-AP0091H service manual 139, E06, E07, Detected at outdoor side

Check code Check code name Cause of operation

[E06] / [04]	Decreased number of indoor units 1. Communication lines (U1, U2) connection
(TCC-L / AI-NET)		error between indoor and outdoor
	2.	Connector connection error of communica-
		tion for indoor P.C. board
	3.	Connector connection error of communica-
		tion for outdoor I/F P.C. board
	4.	Power supply of indoor unit
		(Is power turned on?)
Sub-code:No. of indoor units which received signals normally

Check code	Check code name			Cause of operation
[E07] / [–]	Indoor/Outdoor			1. Outdoor communication terminal resistance
(TCC-L / AI-NET)	communication circuit error			setup error
	(Detected at outdoor side)			2. Indoor/outdoor communication connection
				error
	Is setup of terminal resistance		NO
	of outdoor unit normal?
		YES
					Correct setup of
	Is interconnection cable		YES		terminal resistance.
	(U1, U2) between indoor and

Is there no mis-wiring/	YES
disconnection on communication line
betweenindoor and outdoor?
NO

Correct communication line.

outdoor short-circuited?

NO

Is connection of CN40 connector		NO
on indoor P.C. board normal?
	YES

NO

Correct

Is connection of interconnection cable	Correct short-circuit.
between indoor and outdoor correct?
YES

Is connection of CN01 connector on outdoor I/F P.C. board normal?

YES

NO

Correct wiring of the connector.

communication line.

139

Is power of indoor turned on?

YES

Did a power failure occur?

YES

Is there no noise, etc?

NO

Check indoor P.C. board.

Defect ÆReplace

NO

Turn on power of indoor unit.

NO

Clear the fault code.

YES

Check noise etc. and eliminate it if any.

(NOTE)

1.When signal is not sent for a certain period from the indoor unit which has been sending signals normally, [E06] is displayed.

YES

Correct power cable.

YES

Eliminate noise.

Is there an error on

power cable to an outdoor unit?

NO

Is there noise source?

NO

Outdoor I/FÆP.C. board failure Replace

Is F400 (fuse) on	NO
I/F P.C. board failed?
YES * Check conduction
with tester.

Turn on power to start operation.

I/F P.C. board failure

However an emergent operation is available by inserting connector from CN01 to CN33.