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Shut down OC unit power source, and
make it again.
It will return to normal state at an ac-
cidental case.
When normal state can not be re-
covered, check for the 1) ~ 4) of the
cause.
Shut down both OC and IC power so-
urces simultaneously for 5 minutes or
more, and make them again.
It will return to normal state at an
accidental case.
When normal state can not be re-
covered, check for the 1) ~ 5) of the
cause.
Shut down OC power sources for 5
minutes or more, and make it again.
It will return to normal state at an acci-
dental case.
When normal state can not be re-
covered, check for the 1) ~ 4) of the
cause.
Checking
code
Meaning, detecting method
6607
No ACK error
When no ACK signal is detected in 6 continuous times with 30 second interval by transmission
side controller, the transmission side detects error.
Note: The address/attribute shown on remote controller indicates the controller not
providing the answer (ACK).
Generating
unit address
Display
of trouble
Detecting
method
Cause Checking method & countermeasure
1) Poor contact of transmission line of OC or IC.
2) Damping of transmission line voltage/signal
by acceptable range of transmission wiring
exceeded.
Farthest : Less than 200m
Remote controller wiring : Less than 10m
3) Erroneous sizing of transmission line (Not
within the range below).
Wire diameter : 1.25mm
2
or more
4) Faulty control circuit board of OC
1) When IC unit address is changed or modified
during operation.
2)
Faulty or slipping off of transmission wiring of IC
3) Slipping off of IC unit connector (CN2M)
4) Faulty IC unit controller
5) Faulty remote controller
1) Faulty transmission wiring at IC unit side
2) Faulty transmission wiring of RC
3) When remote controller address is changed
or modified during operation
4) Faulty remote controller
No reply
(ACK) at IC
transmission
to OC
No reply
(ACK) at
RC
transmission
to IC
No reply
(ACK) at IC
transmission
to RC
Remote
controller
(RC)
Remote
controller
(RC)
Remote
controller
(RC)
System
compo-
sition
1Outdoor
unit
(OC)
2Indoor
unit (IC)
3Remote
controller
(RC)
(1) Single refrigerant system
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