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Possible causes
I/U - R/C communication error
(detected by R/C)
AImproper R/C wire connection
BFailure of I/U power supply
CFailure of I/U board
DInvalid R/C address setting
EFailure of R/C board
[E01]
(New 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 “no header”
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.
Troubleshooting (Continued)
3. Troubleshooting for Each Check Code
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