82
PAR-20MAA
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON
OFF
˚C
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
˚C
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
FILTER
CHECK TEST
TEMP.
TIMER SET
“ ” indicator: Appears when current is carried.
(1) For M-NET remote controller systems
Symptom or inspection code
Cause
Inspection method and solution
Though the content of operation is
displayed on the remote
controller, some indoor units do
not operate.
• The power supply of the indoor unit is not on.
• The address of the indoor units in same group or the remote controller
is not set correctly.
• The group setting between outdoor units is not registered to the remote
controller.
• The fuse on the indoor unit controller board is blown.
• Check the part where the
abnormality occurs.
1
The entire system
2
In the entire refrigerant system
3
In same group only
4
One indoor unit only
<In case of the entire system or in
the entire refrigerant system>
• Check the self-diagnosis LED
of the outdoor unit.
• Check the items shown in the
left that are related to the
outdoor unit.
<In case of in same group only or
one indoor unit only>
• Check the items shown in the
left that are related to the
indoor unit.
Though the indoor unit operates,
the display of the remote controller
goes out soon.
• The power supply of the indoor unit is not on.
• The fuse on the indoor unit controller board is blown.
( ) is not displayed on the remote
controller. (M-NET remote controller
is not fed.)
• The power supply of the outdoor unit is not on.
• The number of connected indoor unit in the refrigeration system is over
the limit or the number of connected remote controller is over the limit.
• M-NET remote controller is connected to MA remote controller cable.
• The transmission line of the indoor/outdoor unit is shorted or down.
• M-NET remote controller cable is shorted or down.
"HO" keeps being displayed or it
is displayed periodically. ("HO" is
usually displayed for 3 minutes at
the longest after the power supply
of the outdoor unit is on.)
• The power supply for the feeding expansion unit for the transmission
line is not on.
• The address of the outdoor unit remains "00".
• The address of the indoor unit or the remote controller is not set correctly.
• MA remote controller is connected to the transmission line of the
indoor/outdoor unit.
The remote controller does not
operate though ( ) is displayed.
• The transmission line of the indoor/outdoor unit is connected to TB15.
• The transmission line of the indoor/outdoor unit is shorted, down or
badly contacted.
Potential problems other than those diagnosed for the
remote controller.
a) Single transmission is not possible if error display 2 (“6832
or 6833”) flashes. There is “noise” on the transmission
line, or damage of other remote controller for the indoor
units can be considered. Check the transmission path
and other controller
b) Data error has occurred when error display three shows
“ERC” and number of data errors.
Number of generated data error (maximum 66 errors).
The number of generated data error stands for the
difference in the number of bits of transmitted data from
the remote controller and the actual number of bits that
were transmitted along the transmission path. If this
error occurs, “noise”, etc., is interfering with the transmission
data. Check the transmission path.
(4) Cancel the remote controller diagnosis.
Hold down the CHECK button for five seconds or more to
cancel the remote controller diagnosis. The “HO” operation
lamp will flash, and the display screen will rectum to the
status before remote controller diagnosis in approximately
30 seconds.
• When the number of data errors generated is 02.
Remote controller transmission data
Transmission data at transmission path
a)
b)
From the preceding page.
8-3. REMOTE CONTROLLER TROUBLE
OC183E--3.qxp 10.5.6 3:05 PM Page 82
