Toshiba Super MMU-AP0091H Service Manual page 153

Check code
[E07] / [–]
(d07 / AI-NET)
Is inter-unit cable (U1, U2) between
indoor and outdoor short-circuited?
NO
between indoor and outdoor correct?
Correct
communication line.
YES
Correct power cable.
YES
Eliminate noise.
Check code name
Indoor/Outdoor
communication circuit error
(Detected at outdoor side)
Is setup of end terminal resistance
of outdoor unit normal?
YES
NO
Is connection of inter-unit cable
YES
Is there no error on
power cable to outdoor unit?
NO
Is there noise source?
NO
Outdoor I/F P.C. board failure
Replace
1. Indoor/outdoor communication end terminal
resistance setup error
2. Indoor/outdoor communication connection
error
NO
YES
Correct short-circuit.
Is F400 (fuse) on
I/F P.C. board opened?
YES
I/F P.C. board failure
However an emergent operation is
available by inserting connector to
be connected to CN01 to CN33.
153
Cause of operation
Correct setup of end
terminal resistance.
NO
* Check conduction
with tester.
Turn on power to
start operation.