79
6810
UR communication abnormality (UR: Unit
Remote controller)
Communications between the unit remote
controller and indoor unit is not normal.
1) Contact failure of the unit remote
controller transmission line in the unit
remote controller or indoor unit.
Check whether the transmission line
of the indoor unit or unit remote
controller is connected / loosen or
not.
When there is no display of address and
attribute to the remote controller. (When
detecting by the unit remote controller)
2) Decline of transmission voltage and
signal on the unit remote controller
transmission line by the unit remote
controller transmission line tolerance
over
Check whether the unit remote
controller transmission line tolerance
is over or not.
3) When the transmission signal of unit
remote controller changes by noise.
Check the transmission wave and
noise on the transmission signal of
unit remote controller.
1) It is abnormality though the unit remote
controller transmitted ''H'', when "L"
reception is detected continuously three
times.
4) Unit remote controller transmitting /
receiving signal circuit failure in the unit
remote controller or indoor unit.
When there is not any trouble from
above
1
-
3
, replace the indoor
controller board or unit remote
controller.
2) It is abnormality when there is no
response from the indoor unit for 3
minutes against to ''monitor request'' from
the unit remote controller.
Check of following conditions is
available by LED1/LED2 in the indoor
controller board.
3) It is abnormality when there is no
response 3times continuously from the
indoor unit against to ''operation /setting''
from the unit remote controller.
· When LED1 and 2 blinks at the
same time.
The indoor unit is transmitting to the
unit remote controller.
When the cause of displayed address and
attribute is on the indoor unit side.
· When only LED2 blinks.
The unit remote controller is
transmitting to the indoor unit.
1) It is abnormality though the indoor unit
transmitted ''H'', when "L" reception is
detected continuously three times.
Or, other indoor unit is transmitting to
the unit remote controller.
2) It is abnormality when the indoor units
cannot receive the transmission signal
from the unit remote controller for
3minutes.
·When LED1 and 2 does not blink.
The indoor unit and unit remote
controller is not transmitting.
1
2
6831
6834
6832
6833
Signal reception abnormality (Remote
controller)
Following symptoms are regarded as
abnormality.
1) When the remote controller cannot
receive the signal from indoor controller
normally even once for 3 minutes
2) When sub-remote controller cannot
receive the signal even once for 2 minutes
Signal transmission abnormality (Remote
controller)
Following symptoms are regarded as
abnormality.
1) When sub-remote controller cannot
transmit the signal to the transmission
path for 6 seconds
2) When the remote controller cannot
finish transmitting the signal for 30 times
on end
1
~
3
Perform a check of the remote
controller.
According to the results, perform the
following disposals.
• When "RC OK" is displayed
The remote controller is normal.
Turn off the power supply and turn it
on again.
If "HO" is displayed for 4 minutes or
more, replace the indoor controller
board.
• When "RC NG" is displayed
Replace the remote controller.
• When "RC 6832 or 6833" or "ERC
00-66" is displayed
These displays may be due to noise,
etc.
4
Set one remote controller to main
remote controller and the other to
sub-remote controller.
Defect of the transmission and reception
circuit of the remote controller.
Defect of the transmission and
reception circuit of the indoor controller
board
Noise occurs on the transmission line
of the remote controller
All remote controllers are set as
sub-remote controller.
1
2
3
4
Defect of the transmission and
reception circuit of the remote controller
Noise occurs on the transmission line
of the remote controller
There are two main remote controllers.
1
2
3
3
4
Display
Meaning and detecting method
Causes
Check points
OC183E--3.qxp 10.5.6 3:05 PM Page 79
