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139
Check code
[E06] / [04]
(TCC-L / AI-NET)
Check code name
Decreased number of indoor units
Cause of operation
1. Communication lines (U1, U2) connection
error between indoor and outdoor
2. Connector connection error of communica-
tion for indoor P.C. board
3. Connector connection error of communica-
tion for outdoor I/F P.C. board
4. Power supply of indoor unit
(Is power turned on?)
Sub-code: No. of indoor units which received signals normally
(NOTE)
1. When signal is not sent for a certain period from the indoor unit
which has been sending signals normally, [E06] is displayed.
Is power of indoor turned on?
Did a power failure occur?
Is there no noise, etc?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Is there no mis-wiring/
disconnection on communication line
betweenindoor and outdoor?
Is connection of CN40 connector
on indoor P.C. board normal?
Is connection of CN01 connector
on outdoor I/F P.C. board normal?
Check indoor P.C. board.
Defect Replace
Check noise etc. and eliminate it if any.
Clear the fault code.
Turn on power of indoor unit.
Correct wiring of the connector.
Correct communication line.
Check code
[E07] / [–]
(TCC-L / AI-NET)
Check code name
Indoor/Outdoor
communication circuit error
(Detected at outdoor side)
Cause of operation
1. Outdoor communication terminal resistance
setup error
2. Indoor/outdoor communication connection
error
Is there noise source?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Is setup of terminal resistance
of outdoor unit normal?
Is connection of interconnection cable
between indoor and outdoor correct?
Is there an error on
power cable to an outdoor unit?
Is F400 (fuse) on
I/F P.C. board failed?
Outdoor I/F P.C. board failure
Replace
Eliminate noise.
Correct power cable.
Correct
communication line.
I/F P.C. board failure
However an emergent operation
is available by inserting connector
from CN01 to CN33.
Correct short-circuit.
* Check conduction
with tester.
Turn on power to
start operation.
Correct setup of
terminal resistance.
Is interconnection cable
(U1, U2) between indoor and
outdoor short-circuited?