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TROUBLESHOOTING (CONTINUED)
3. Troubleshooting for Each Check Code
Are R/C wires
A/B correct?
YES
NO
Improper harness
connection from
I/U terminal block?
Group control
operation?
Are all indoor
units powered ON?
Is R/C powered ON?
A/B terminals:
Approx. 18VDC
Is gno header h
set by double R/C?
YES
NO
NO
YES
NO
YES
NO
YES
YES
NO
Correct R/C wires.
.
Correct connector connection.
Check circuit wiring.
Check I/U power connection
(power off and on).
Check I/U boards.
→
Replace defective board.
Correct one header/one follower.
(R/C address connector)
Check R/C board.
→
Replace it if necessary.
Check code
Check code name
Possible causes
I/U - R/C communication error
(detected by R/C)
A.Improper R/C wire connection
B.Failure of I/U power supply
C. Failure of I/U board
D. Invalid R/C address setting
E.Failure of R/C board
[E01]
(New code)