Toshiba Super MMU-AP0091H Service Manual page 151

Check code
[E04] / [04]
(d07 / AI-NET)
Was power turned on in order
of indoor unit outdoor unit?
YES
Is connection (U1/U2 terminals) of
indoor/outdoor inter-unit cable normal?
YES
Is connector connection from
U1/U2 terminals of indoor/outdoor
inter-unit cable normal?
YES
Is the end terminal resistance
setup of outdoor unit normal?
YES
Is address setup correct?
YES
Is power applied to fuse (F03)
on indoor P.C. board?
YES
Is there no noise, etc?
NO
Check indoor P.C. board.
Defect Replace
Check code name
Indoor/Outdoor
communication circuit error
(Detected at indoor side)
NO
NO
NO
NO
NO
NO
YES
For details, refer to "Troubleshooting in test operation".
151
Cause of operation
1. Power of outdoor unit was firstly turned on.
2. Connection error of communication line
between indoor and outdoor
3. End terminal resistance setup error on
communication between indoor and outdoor
4. Address setup error
Turn on power again in order of
indoor unit outdoor unit.
Correct inter-unit cable.
Correct connector connection.
Correct the end terminal resistance setup.
Set up address again.
Check connection of inter-unit cable between
indoor and outdoor is correct, and then
connect communication line connector on
indoor P.C. board (CN40) to CN44 (EMG).
Check noise, etc, and eliminate it if any.