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–121–
Checking
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 BC
controller
<master>
(BC)
3 BC
controller
<slave>
(BS)
4 Indoor
unit (IC)
5 Remote
controller
(RC)
(1) Single refrigerant system
Remote
controller
(RC)
Remote
controller
(RC)
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
OC
transmis-
sion to BC
No reply
(ACK) at
BC <master>
transmis-
sion to IC
No reply
(ACK) at
BC <slave>
transmis-
sion to BC
<master>
No reply
(ACK) at IC
transmis-
sion to RC
No reply
(ACK) at
RC
transmis-
sion to IC
1) Poor contact of transmission line of OC or BC.
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 BC controller (master) address is
changed or modified during operation.
2) Faulty or disconnection of transmission wir-
ing of BC controller (master).
3) Slipping off of BC unit connector (CN02).
4) Faulty BC controller (master) circuit board.
1) When BC controller (slave) is changed or
modified during operation.
2) Faulty or disconnection of transmission wir-
ing of BC controller (slave).
3) Slipping off of BC unit connector (CN02).
4) Faulty BC controller (slave) circuit board.
1) When IC unit address is changed or modified
during operation.
2) Faulty or disconnection of transmission wir-
ing 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 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 acci-
dental case.
When normal state can not be re-cov-
ered, check for the 1) ~ 4) of the cause.
Shut down both OC and master BC
power sources simultaneously for 5 min-
utes 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.
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 acci-
dental 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.