Fujitsu R407C Service Manual page 113

LED display
Indoor Outdoor Remote
unit unit controller
PCB LED
Body
LCD
LED
1 to 6
Normal Normal Filter sign
display display display
Controlling Controlling
Normal
display display
display
(Operation (Oil recovery
display LED operation)
flashes)
Error display
Normal Error display
display
(Indoor unit (Indoor unit
fan error)
fan error)
Error display Error display
Error display
(Thermistor
(Indoor unit
(Thermistor
error)
error)
error)
Normal Normal
Normal
display display
display
or
Error display
(Discharge
temperature
error)
No display Cannot be
No display
specified
or
Error display
Error display
(Cannot be (Cannot be
specified.) specified.)
Cannot be No display Cannot be
specified. specified.
or
Error display
(Cannot be
specified.)
Symptom that
can occur other
than title
The meshes of the filter were
clogged up.
Abnormal sound
Oil recovery operation control is
is heard from
in progress.
indoor unit.
Indoor fan capacitor is faulty.
Indoor fan motor is faulty.
System does
Indoor unit thermistor is faulty.
not cool/heat.
System does Indoor unit short circuit.
not cool/heat.
System does
Indoor control PCB is faulty.
not cool/heat.
or
Abnormal
sound
is heard from
indoor unit.
System does
Outdoor control PCB is faulty.
not cool/heat.
Abnormal
sound
is heard from
indoor unit.
Check method
Cause
(Error state check method)
Check if the filter is dirty.
All indoor unit fans stop and the
signal sent from remote control-
ler is not accepted by indoor unit.
Check the resistance value of
the capacitor.
(If normal, the resistance will
show a value of several hundred
kilohms.)
Check the fan motor resistance
or voltage.
Measure the thermistor
resistance and compare it to
the ambient temperature.
Air flow out from an indoor
unit is sucked directly into the
same indoor unit or into another
indoor unit.
Symptom has many branches,
depending on the error contents,
and there is no effective check
method.
Symptom has many branches,
depending on the error contents,
and there is no effective check
method.
05-37
Remarks
When the operating time of fan
motor of any indoor unit exceeds
150 hours, the filter cleaning sign
appears at the wired remote
controller.
The operating time of fan motor
can be reset by pushing the
ZONE/SET button for more than
3 seconds.
The filter cleaning sign is in-
formed by flashing of the set
temperature display(1 sec. ON,
1 sec. OFF and repeat).
1st oil recovery operation: 1 hour
(operation time) after the power
turned on. 2nd oil recovery opera-
tion and afterwards: every 6
hours (operation time).
Operation LED flashes (3 sec.
ON, 1 sec. OFF and repeats).
Large ceiling type, slim body cas-
sette type and ceiling wall type
will inform the error.(Others don't)
Warning:
1) For large ceiling model or slim
body cassette model, p erform ch-
eck by following procedures:
(1)Turn off the power of indoor
unit. Wait for several minutes.
(2)Disconnect the plug from PCB.
(3)Fully discharge the electricity
before doing check.
(4)Check the resistance of capa-
citor for large ceiling or slim body
cassette. 1-2 of terminal CN3.
(5)Check the motor resistance:
For large ceiling model, check re-
sistances (4-5, 5-6) of CN4.
For slim body cassette model,
check resistances (5-6, 5to1,2,4)
of CN4.
2) For ceiling wall model, check
the voltages of CN3:
V =340(V), V =15(V),
6-4 3-4
V =2-8 (V)
2-4
Refer to section 7-2-1 for the
temperature and thermistor
resistance relationship.
When thermistor shorted
or open, error occurs.
If the problem is caused by PCB
or connection wire the trouble is
often sloved by a change of PCB
or connection wire.
If the problem is caused by PCB
or connection wire the trouble is
often sloved by a change of PCB
or connection wire.