Diagnosis Procedure For Each Check Code - Toshiba MMD-AP0071SH-C Service Manual

8-5. Diagnosis Procedure for Each Check Code

Check code Check code name
[E01] / [–] Communication error between
indoor and remote controller
(d07 / AI-NET)
(Detected at remote controller side)
NO
Is the inter-unit cable of
remote controllers (A/B) normal?
YES
Is there no disconnection or
YES
connector contact error on harness out
of terminal block of indoor unit?
NO
NO
Is a group control operation?
YES
NO
Is power of each indoor unit turned on?
YES
NO
Is power applied to remote controller?
AB terminals: Approx. DC18V
YES
YES
Is setup of two remote controllers
without main remote controller?
NO
Check code Check code name
[E02] / [–] Remote controller sending error
(d07 / AI-NET)
* It is not displayed on 7-segment display of the central control controller.
NO
Is communication cabling between
remote controller and indoor unit correct?
YES
Sending circuit error
inside of the remote controller
Replace remote controller.
Cause of operation
1. Remote controller inter-unit cable error
2. Indoor power error
3. Indoor P.C. board error
4. Remote controller address setup error
5. Remote controller P .C. board error
Correct inter-unit cable of
remote controller.
Correct connector connection
and check circuit cabling.
Check power connection status of
indoor unit. (Turn on power again.)
Check indoor P.C. board.
Defect Replace
Change one to main/other to sub.
(Remote controller address connector)
Check remote controller P.C. board.
Defect Replace
Cause of operation
Signal could not be sent to indoor unit.
Check the communication wire of the remote
controller.
Correct the communication cabling.
Check code Check code name
[E03] / [97] Communication error between
indoor and remote controller
(d07 / AI-NET)
(Detected at indoor side)
This error is detected when the indoor unit cannot receive a signal from the remote controller.
Check communication wires of the remote controllers A and B.
As communication is impossible, this check code [E03] is not displayed on the main remote controller.
It is displayed on TCC-LINK central controller.
Check code Check code name
[E04] / [04] Indoor/Outdoor
communication circuit error
(d07 / AI-NET)
(Detected at indoor side)
NO
Was power turned on in order
of indoor unit outdoor unit?
YES
NO
Is connection (U1/U2 terminals) of
indoor/outdoor inter-unit wire normal?
YES
Is connector connection from
NO
U1/U2 terminals of indoor/outdoor
inter-unit wire normal?
YES
NO
Is the end terminal resistance
setup of outdoor unit normal?
YES
NO
Is address setup correct?
YES
NO
Is power applied to fuse (F03)
on indoor P.C. board?
YES
YES
Is there no noise, etc?
NO
Check indoor P.C. board.
Defect Replace
Cause of operation
No communication from remote controller and
communication adaptor
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 wire.
Correct connector connection.
Correct the end terminal resistance setup.
Set up address again.
Check connection of inter-unit wire 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.
For details, refer to "Troubleshooting in test operation".