8-4-1
1. Indoor unit fan does not operate normally
LED display
Indoor
Outdoor
Remote
Body
PCB LED
No display Error
display
(Transmission
line error)
Error
display
(Remote
controller
error)
Error
display
(Indoor-unit
error)
Normal
display
or
no display
Normal
display
Normal
display
Thermo-control
Check method
Remarks
Symptom that
can occur other
than title
Cause
No display
Normal after the power reset.
Normal
display
Normal
display
or
no display
Normal
display
– 114 –
Troubleshooting (No error code)
How to read the tables
1.Select the relevant item errors 1 to 5 below,and decide the table to be used.
2.Deduce "Cause" from "LED display" and "Symptom that can occur other than title".
Normal after the power reset.
(Error state check method)
3.Check if the deduced "Cause" is correct by means of "Check" and "Remarks".
When there is no error code display at the indoor unit ,outdoor unit or centralized remote controller,
but there is one of the following operation errors,check the cause in the following order:
1.Indoor fan does not operate normally
2.System does not cool or heat
3.Indoor unit makes an abnormal sound
4.Water leaking from indoor unit
5.Others
Power not supplied to indoor unit
Circuit breaker OFF
Power line faulty
Check the voltage across indoor
unit power supply terminal
board (Power Supply) terminals
1-2.
Voltage across 1-2: 220~240V
Indoor unit leakage
(short circuit).
(Circuit to which voltage is
applied when energized is
leaking electricity.)
Drop the indoor unit power supply
terminal board (Power Supply1,2)
and indoor unit metal part
resistance value to near zero by
opening the circuit breaker
indoor unit circuit breaker to ON.
When shorted,the resistance
across indoor unit power supply
terminal board(Power Supply)
terminals 1-2 approaches zero.
Indoor unit leaking
(Circuit to which voltage is
applied only during operation is
leaking electricity.)
(short circuit).
When the indoor unit circuit
breaker trips during operation,
locate the faulty indoor unit by
disconnecting the PCBs one by
one (disconnect CN1).
Then check the individual
electric parts for leakage.
If short-circuited,the resistance
across the electric parts will
indicate a value near zero.
Communication faulty between
indoor unit and remote controller
(wired).
Open circuit.
When 1-2, 2-3, and 3-1 at the
indoor unit terminal board
(Remote Control) are shorted,
the resistance across red-white,
white-black, and black-red
does not indicate a value near
zero.
Remote control group control
interior communication line faulty.
Open circuit
Check the wiring color and wiring
connection of indoor unit terminal
board(Remote Control)
terminals 1,2, and 3.
Wiring color and indoor unit
terminal board(Remote Control)
combinations are red-1,white-2,
and black-3.
Communication line faulty
between indoor unit and remote
controller(wired)
Erroneous connection
(polarity incorrect)
When terminals 1-2, 2-3, and 3-1
at the indoor unit terminal board
(Remote Control) are shorted,
the resistance across red-white,
white-black, and black-red at the
remote control terminals does
not indicate a value near zero.
Remote control group control
interior communication line faulty.
Erroneous connection
(Polarity incorrect)
Check the wiring color and wiring
connection of indoor unit terminal
board(Remote Control)
terminals 1,2, and 3.
Wiring color and indoor unit
terminal board(Remote Control)
combinations are red-1,white-2,
and black-3.
Remote controller master/slave
setting switch (DIP SW 1-4)
setting incorrect.
When indoor unit operated for
each remote control group,
operation is abnormal.
Does not operate when there
is no master unit
remote control group.
(SW 1-4 set to OFF) in one
Capacity of indoor fan
capacitor faulty.
Check the indoor unit Model No.
and capacity of the capacitor.
Set temperature is set to near
room temperature and louver
operation signal is not received.
Indoor fan operates a little every
five minutes during thermo-
control.
Cold air blow prevention control
in progress(heating operation)
Area (heat exchanger) near
indoor unit outlet is not warm
and up-down louvers are set to
horizontal position.
Wait several minutes,
then restart the heating
operation.
Cool/heat switching
control in progress
(heat recovery type)
At least 3 minutes did not elapse
after switching from cooling to
heating or from heating to
When the operating state was
switched from cool to heat,
heat to cool ,or stop to heat,
it takes 3 minutes to balance the
refrigerant pressure in the
RB unit.
immediately after setting the
communi-
cation system
Normal
display
cooling.
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