Toshiba MMU-AP0121MH - Manual (Page 66)

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Check code
[E06]
Check code name
Decreased number of indoor units
Cause of operation
1. Communication lines (U1, U2) connection
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 board
4. Power supply of indoor unit
(Is power turned on?)
Auxiliary code : No. of indoor units which received signals normally
(NOTE)
1. When signal is not sent for a certain period from the indoor unit
which has used to send signals normally, [E06] is displayed.
Is power of indoor turned on?
Did a power failure occur?
Is there no noise, etc?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Is there no miscabling/
disconnection on communication line
betweenindoor and outdoor?
Is connection of CN40 connector
on indoor P.C. board normal?
Is connection of CN01 connector
on outdoor I/F P.C. board normal?
Check indoor P.C. board.
Defect Replace
Check noise, etc, and eliminate it if any.
Clear the check code.
Turn on power of indoor unit.
Correct cabling of cable connector.
Correct communication line.
Check code
[E07]
Check code name
Indoor/Outdoor
communication circuit error
(Detected at outdoor side)
Cause of operation
1. Indoor/outdoor communication end terminal
resistance setup error
2. Indoor/outdoor communication connection
error
Is there noise source?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO Is setup of end terminal resistance
of outdoor unit normal?
Is inter-unit cable (U1, U2) between
indoor and outdoor short-circuited?
Is connection of inter-unit wire
between indoor and outdoor correct?
Is there no error on
power wire to outdoor unit?
Is F400 (fuse) on
I/F P.C. board opened?
Outdoor I/F P.C. board failure
Replace
Eliminate noise.
Correct power wire.
Correct
communication line.
I/F P.C. board failure
However an emergent operation is
available by inserting connector to
be connected to CN01 to CN33.
Correct short-circuit.
* Check conduction
with tester.
Turn on power to
start operation.
Correct setup of end
terminal resistance.