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Shut down OC power source simulta-
neously for 5 minutes or more, and
make them again.
It will return to normal state at an acci-
dental case.
When normal state can not be re-cov-
ered, check for the 1) ~ 4) of the cause.
Check
code
6607
Meaning, detecting method
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).
1
Outdoor
unit (OC)
2
Indoor
unit (IC)
3
Remote
controller
(RC)
(1) Single refrigerant system
Remote
controller
(RC)
Remote
controller
(RC)
Remote
controller
(RC)
System
compo-
sition
Generating
unit address
Display of
trouble
Detecting
method
Cause
Checking method & countermeasure
No reply
(ACK) at
IC
transmis-
sion to OC
No reply
(ACK) at
RC
transmis-
sion to IC
No reply
(ACK) at IC
transmis-
sion to RC
1) Poor contact of transmission line of OC.
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.
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-cov-
ered, check for the 1) ~ 4) of the cause.
Shut down OC power sources for 5 min-
utes or more, and make it again.
It will return to normal state at an acci-
dental case.
When normal state can not be re-cov-
ered, check for the 1) ~ 4) of the cause.
Check
code
6606
Meaning, detecting method
Cause
Checking method & Countermeasure
1) Data is not properly transmitted due
to casual errouneous operation of
the generating controller.
2) Faulty generating controller.
Communications with transmis-
sion processor error
Communication trouble between
apparatus processor and trans-
mission processor.
Note:
The address/attribute
shown on remote
controller indicates the
controller which has
detected error.
Turn off power sources of indoor unit, BC controller
and outdoor unit.
When power sources are turned off sepa-
rately, microcomputer is not reset and nor-
mal operations can not be restored.
→
Controller trouble is the source of the trouble
when the same trouble is observed again.
