Trouble Shooting With No Error Code - Fujitsu R407C Service Manual

5-5-2 TROUBLE SHOOTING WITH NO ERROR CODE

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".
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.
1. Indoor unit fan does not operate normally
LED display
Indoor Outdoor Remote
unit unit controller
Body PCB LED
LCD
LED 1 to 6
No display Error No display
display
(Transmission
line error)
Become normal after the power
is reset.
Error display Normal
Error display
display
(Indoor unit
(Remote
or
error)
controller
no display
communi-
cation system
error)
Become normal after the power
is reset.
Normal Normal
Normal
display display
display
or
no display
Normal Normal Normal
display
display display
3.Abnormal sound is heard from indoor unit.
4.Water leaking from indoor unit.
5.Others.
Symptoms that
can occur other
Cause
than title
Power is not supplied to indoor
unit.
Circuit breaker is at OFF position.
Power line is faulty.
Indoor unit is short circuiting.
(The circuit to which voltage is
applied when operation is short
circuiting (leakage of electricity).)
Indoor unit is short circuiting.
(The circuit to which voltage is
applied when operation is short
circuiting (leakage of electricity).)
Communication line is faulty be-
tween indoor unit and wired
remote controller or simple
remote controller.
Open circuit.
Communication line between
indoor units for remote controller
group control is faulty.
Open circuit.
Communication line is faulty be-
tween indoor unit and wired
remote controller or simple
remote controller.
Erroneous connection.
(polarity incorrect)
Communication line between
indoor units for remote controller
group control is faulty.
Erroneous connection.
(polarity incorrect)
The setting of master/slave
setting switch (DIP SW 1-4) of
the remote controller is not
correct.
Capacity of the indoor fan
capacitor is faulty.
Thermo-control
Cold air prevention control is
in progress (heating operation).
Cool/heat switching control is in
progress.
05-36
Check method
(Error state check method)
Check the voltage between power
supply terminals 1 and 2 of each
indoor units.
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.
When the indoor unit circuit If short circuited,there is a elec-
breaker trips during operation,
tric part whose resistance
locate the faulty indoor unit by
between two electrodes will
disconnecting the PCBs one by
indicate a value near zero.
one (disconnect CN1).
Then check the individual
electric parts to distinguish the
parts which cause the leakage of
electricity.
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.
The combinations of wiring color
Check the wiring color and the
and indoor unit terminal board for
wiring connection of indoor unit
remote controller are as following:
terminal board for remote control-
red to1, white to 2 and black to 3.
ler.
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 The combinations of wiring color
wiring connection of indoor unit and indoor unit terminal board for
terminal board for remote control- remote controller are as following:
ler. red to1, white to 2 and black to 3.
When indoor unit operated for
each remote control group,
operation is abnormal.
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.
The area (heat exchanger) near
outlet of the indoor unit is not
warm and up/down louvers are
set to a horizontal position.
At least 3 minutes did not elapse
after switching the operation
mode from cooling to heating or
from heating to cooling.
Remarks
Voltage between terminals 1 and
2: 220~240V
When short circuit occurred,the
resistance between power supply
terminals 1 and 2 of indoor unit
approaches to zero.
Do not start to operate when
there is no master unit (SW 1-4
set to OFF) in one remote
controller group.
Indoor fan operates 1-2 minutes
for every five minutes during
thermo-control.
Wait several minutes,
then restart the heating
operation.
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.