83
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.
( ) is not displayed on the remote
controller. (MA remote controller is
not fed.)
"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 remote controller does not
operate though ( ) is displayed.
• The power supply of the indoor unit is not on.
• Wiring between indoor units in same group is not finished.
• The indoor unit and Slim model are connected to same group.
• 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 (Master) is not on.
• In case of connecting the system controller, the setting of the system
controller does not correspond to that of MA remote controller.
• The fuse on the indoor unit (Master) controller board is blown.
The remote controller is not fed until the power supply of both indoor unit
and outdoor unit is on and the start-up of both units is finished normally.
• The power supply of the indoor unit is not on.
• The power supply of the outdoor unit is not on.
• The number of connected remote controller is over the limit
(Maximum: 2 units) or the number of connected indoor unit that is
over the limit (Maximum: 16 units).
• The address of the indoor unit is "00" and the address for the outdoor
unit is the one other than "00".
• The transmission line of the indoor/outdoor unit is connected to TB15.
• MA remote controller is connected to the transmission line of the
indoor/outdoor unit .
• The remote controller cable is shorted or down.
• The power supply cable or the transmission line is shorted or down.
• The fuse on the indoor unit controller board is blown.
• The power supply of the outdoor unit is not on.
• The power supply of the feeding expansion unit for the transmission
line is not on.
• The setting of MA remote controller is not main remote controller, but
sub-remote controller.
• MA remote controller is connected to the transmission line of the
indoor/outdoor unit.
• The power supply of the indoor unit (Master) is not on.
• 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.
•The fuse on the indoor unit controller board is blown.
Symptom
Even the cooling (heating)
operation selection button
is pressed, the indoor unit
cannot be operated.
The auto vane runs freely.
Fan setting changes during
heating.
Fan stops during heating
operation.
Fan does not stop while
operation has been stopped.
No setting of fan while start
SW has been turned on.
Indoor unit remote controller
shows “HO” indicator for
about two minutes when tur-
ning ON power supply.
Drain pump does not stop
while unit has been stopped.
Drain pump continues to
operate while unit has been
stopped.
Display of remote controller
"Cooling (Heating)" blinks
Normal display
Normal display
"Defrost "
Light out
STAND BY
“HO” blinks
Light out
—
CAUSE
The indoor unit can not cool (heat) if other indoor units are heating
(cooling).
Because of the control operation of auto vane, it may change over
to horizontal blow automatically from the downward blow in cooling
in cause the downward blow operation has been continued for one
hour. At defrosting in heating, hot adjusting and thermostat OFF, it
automatically changes over to horizontal blow.
Ultra-low speed operation is commenced at thermostant OFF.
Light air automatically change over to set value by time or piping
temperature at thermostat ON.
The fan is to stop during defrosting.
Fan is to run for one minute after stopping to exhaust residual heat
(only in heating).
Utra-low speed operation for 5 minutes after SW ON or until piping
temperature becomes 35
°
C. There low speed operate for 2 minu-
tes, and then set notch is commenced. (Hot adjust control)
System is being driven.
Operate remote controller again after “HO” disappears.
After a stop of cooling operation, unit continues to operate drain
pump for three minutes and then stops it.
Unit continues to operate drain pump if drainage is generated, even
during a stop.
(2) For MA remote controller systems
8-4. THE FOLLOWING SYMPTOMS DO NOT REPRESENT TROUBLE (EMERGENCY)
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