151
Check code
[E04] / [04]
(d07 / AI-NET)
Check code name
Indoor/Outdoor
communication circuit error
(Detected at indoor side)
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
For details, refer to “Troubleshooting in test operation”.
Is address setup correct?
Is there no noise, etc?
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Is connector connection from
U1/U2 terminals of indoor/outdoor
inter-unit cable normal?
Was power turned on in order
of indoor unit outdoor unit?
Is the end terminal resistance
setup of outdoor unit normal?
Is power applied to fuse (F03)
on indoor P.C. board?
Is connection (U1/U2 terminals) of
indoor/outdoor inter-unit cable normal?
Check indoor P.C. board.
Defect Replace
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).
Correct inter-unit cable.
Turn on power again in order of
indoor unit
outdoor unit.
Correct connector connection.
Correct the end terminal resistance setup.
Set up address again.
Check noise, etc, and eliminate it if any.
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