5-5-2 TROUBLE SHOOTING WITH NO ERROR CODE
1. Indoor unit fan does not operate normally
LED display
Indoor
unit
Outdoor
unit
Remote
controller
Body
LED
PCB LED
1 to 6
LCD
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
Symptoms that
can occur other
than title
Cause
No display
Normal
display
Normal
display
or
no display
Normal
display
How to read the tables
1.Select the relevant item of errors from 1 to 5 below,and decide the table to be used.
2.Deduce "Cause" from "LED display" and "Symptoms that can occur other than title".
(Error state check method)
3.Check if the deduced "Cause" is correct by means of "Check method" and "Remarks".
When there is no error code display at the indoor unit ,outdoor unit or central 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.Abnormal sound is heard from indoor unit.
4.Water leaking from indoor unit.
5.Others.
Power is not supplied to indoor
unit.
Circuit breaker is at OFF position.
Power line is faulty.
Check the voltage between power
supply terminals 1 and 2 of each
indoor units.
Voltage between terminals 1 and
2: 220~240V
Indoor unit is short circuiting.
(The circuit to which voltage is
applied when operation is short
circuiting (leakage of electricity).)
When short circuit occurred,the
resistance between power supply
terminals 1 and 2 of indoor unit
approaches to zero.
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 to distinguish the
If short circuited,there is a elec-
tric part whose resistance
between two electrodes will
indicate a value near zero.
Communication line is faulty be-
tween indoor unit and wired
remote controller or simple
remote controller.
Open circuit.
When any of 1-2, 2-3, and 3-1 at
the indoor unit terminal board for
remote controller are shorted,
however, the resistances between
red and white or white and black
or black and red do not indicate
a value near zero.
Check the wiring color and the
wiring connection of indoor unit
terminal board for remote control-
ler.
The combinations of wiring color
and indoor unit terminal board for
remote controller are as following:
red to1, white to 2 and black to 3.
Communication line is faulty be-
tween indoor unit and wired
remote controller or simple
remote controller.
Erroneous connection.
(polarity incorrect)
The setting of master/slave
setting switch (DIP SW 1-4) of
the remote controller is not
correct.
When indoor unit operated for
each remote control group,
operation is abnormal.
Do not start to operate when
there is no master unit (SW 1-4
set to OFF) in one remote
controller group.
Capacity of the indoor fan
capacitor is faulty.
Check the indoor unit Model No.
and capacity of the capacitor.
The set temperature is very close
to the room temperature and a
sent louver operation signal is
not accepted by indoor unit.
Indoor fan operates 1-2 minutes
for every five minutes during
thermo-control.
Cold air prevention control is
in progress (heating operation).
The area (heat exchanger) near
outlet of the indoor unit is not
warm and up/down louvers are
set to a horizontal position.
Wait several minutes,
then restart the heating
operation.
Cool/heat switching control is in
progress.
At least 3 minutes did not elapse
after switching the operation
mode from cooling to heating or
from heating to cooling.
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.
communi-
cation system
Normal
display
Become normal after the power
is reset.
05-36
The breaker falls immediately
after turning on the breaker of
the indoor units. The resistance
between the power terminal block
and the metal parts of any indoor
units is almost zero.
Indoor unit is short circuiting.
(The circuit to which voltage is
applied when operation is short
circuiting (leakage of electricity).)
Become normal after the power
is reset.
parts which cause the leakage of
electricity.
Communication line between
indoor units for remote controller
group control is faulty.
Open circuit.
When any of 1-2, 2-3, and 3-1 at
the indoor unit terminal board for
remote controller are shorted,
however, the resistances between
red and white or white and black
or black and red do not indicate
a value near zero.
Communication line between
indoor units for remote controller
group control is faulty.
Erroneous connection.
(polarity incorrect)
Check the wiring color and the
wiring connection of indoor unit
terminal board for remote control-
ler.
The combinations of wiring color
and indoor unit terminal board for
remote controller are as following:
red to1, white to 2 and black to 3.
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