Fujitsu R407C Service Manual page 118

LED display
Indoor Outdoor Remote
unit unit controller
Body PCB LED
LCD
LED 1 to 6
Controlling Controlling Normal
display display
display
(Operation
(Defrosting
display LED
operation)
flashing) 1
Error display Error display Error display
(Outdoor unit (Compressor (Outdoor
error display)
error) unit error)
Error display
Error display Error display
(Reverse
(Outdoor (Outdoor
phase error)
unit error) unit error)
Error display
Error display Error display
(Communi-
(Communi- (Communi-
cation
cation cation
error)
error) error)
Become normal after the power
is reset.
No display
No display Cannot be
or error
or error specified.
display display
(cannot be
(cannot be
specified)
specified)
No display or
Cannot be Cannot be
error display
specified. specified.
(cannot be
specified)
Symptom that
Cause
can occur other
than title
Defrosting operation in progress.
2
Compressor is faulty.
Compressor is faulty.
Compressor lock
Compressor is faulty.
Compressor motor burned
Compressor is faulty.
Reverse phase
Outdoor unit communication
PCB is faulty.
The fan of the
Indoor unit control PCB is faulty. The symptom has many
indoor unit
does not rotate.
Abnormal sound
is heard from
indoor unit.
The fan of the Outdoor unit control PCB is faulty. The symptom has many
indoor unit
does not rotate.
Abnormal sound
is heard from
indoor unit.
Check method
(Error state check method)
Outdoor unit heat exchanger
extremely cold. (- 5 C or less)
Voltage (AC380-415V) is applied
to secondary side of magnetic
relay, but compressor does not
operate.
Compressor lock
Compressor motor burned
When the compressor does not
operate, measure the line-to-line
and line-to-ground resistance of
the compressor.
(When the compressor is locked,
the resistance will show a nomal
value.)
When the compressor does not
operate, measure the line-to-line
and line-to-ground resistance of
the compressor.
(When the motor is burned, the
line-to-line resistance increases
(open circuit) and line-to-ground
resistance decreases.)
The compressor operates, but
the high pressure does not rise.
When power reset for the outdoor
or indoor unit is repeated,
a communication error is
generated.
branches, depending on the
error contents, and there is no
effective check method.
branches, depending on the
error contents, and there is no
effective check method.
05-42
Remarks
1
Operation display LED
flashes ( 3 seconds ON,
1 second OFF) and repeats.
2 DEFROST message
appears on the display of
the remote controller.
When one or two of three com-
pressors damaged, recovery
operationwill start automatically.
Resistance of compressor at 25 C
(line-to-line)
Comp. 1 : 8.64 (+/- 7%).
Comp. 2 : 3.700 (+/- 7%).
Comp. 3 : 0.517 (+/- 7%).
When this trouble occurs, the oil
in the compressor has deteriorat-
ed (with black color).
Therefore, long-term operation
should avoid because it will
cause another compressor lock.
When this trouble occurs, the oil
may not deteriorate.
Therefore, operation can be
continued, the power line of
the demaged compressor
must be disconnected.
The compressor wiring is red-R,
white-S, and black-T.
If the display returns to normal by
reset during no communicating
period, the communication
PCB or communication line
may be abnormal.
When the PCB or the connection
wiring is faulty, problem can
often be solved by replacing
the PCB.
When the PCB or the connection
wiring is faulty, problem can
often be solved by replacing
the PCB.