–121–
Checking
code
6607
Meaning, detecting method
No ACK error
When no-ACK signal is detected 6 consecutive intervals of 30 seconds by transmission
side controller, the transmission side detects error.
Note:
The address/attribute shown on remote controller indicates that the
controller is not sending acknowledgement signals.
1
Outdoor
unit (OC)
2
BC
controller
<master>
(BC)
3
BC
controller
<slave>
(BS)
4
Indoor
unit (IC)
5
Remote
controller
(RC)
(1) Single refr
iger
ant 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) BC controller (master) address is changed or
modified during operation.
2) Faulty or disconnection of transmission wir-
ing of BC controller (master).
3) Disconnection 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) Disconnection 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 wiring of IC.
3) Disconnection 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
switch on again.
It will return to normal state in an acci-
dental case.
When the normal state cannot be re-
stored, check 1) through 4) for the cause.
Shut down both OC and IC power
sources simultaneously for 5 minutes or
longer and then switch on again.
It will return to the normal state in an
accidental case. When the normal state
cannot be restored, check for 1)-4) for
the cause.
Shut down both OC and master BC
power sources simultaneously for 5 min-
utes or longer and then switch on again.
It will return to the normal state in an
accidental case. When the normal state
cannot be restored, check for 1)-4) for
the cause.
Shut down both OC and IC power
sources simultaneously for 5 minutes or
longer and then switch on again.
It will return to the normal state in an
accidental case. When the normal state
cannot be restored, check for 1)-4) for
the cause.
Shut down both OC power source for 5
minutes or longer and then switch on
again.
It will return to the normal state in an
accidental case. When the normal state
cannot be restored, check for 1)-4) for
the cause.