Fujitsu AirStage AB12, Service Manual

Page: 123 / 199

5. Others
PCB LED
1 to 6
LCD
LED display
Remote
controller Indoor
unit Outdoor
unit
– 123–
Normal
display Normal
display Normal
display Indoor unit electronic expansion
valve opening faulty. When the indoor unit power is
reset 5~10 times at a 2~3
minutes interval, the expansion
valve may close.
Coil resistance (red-white,
red-orange, brown-blue,
brown-yellow) : 100~200
Indoor unit
other than
relevant indoor
unit does not
perform cooling.
Indoor unit
makes an
abnormal
sound. Indoor unit electronic expansion
valve opening faulty. Area (heat exchanger) near the
air diffuser is not cooled even
after several minutes have
elapsed after the relevant indoor
unit was stopped.
(Gas pipe is cold.)
When the electronic expansion
valve is open excessively, other
indoor units may not operate at
full capacity or a loud refrigerant
rushing sound may be generated.
Indoor unit
other than
relevant indoor
unit does not
perform cooling.
Indoor unit
makes an
abnormal sound.
Icing at indoor
unit heat
exchanger.
Indoor unit electronic expansion
valve opening faulty. The area (heat exchanger) near
the air diffuser of the stopped
relevant indoor unit is cold.
(Gas pipe is cold.) When the electronic expansion
valve opens, the stopped indoor
heat exchanger may ice and
water leakage or other trouble
may occur.
Indoor unit
other than
relevant indoor
unit does not
perform heating.
Relevant indoor
unit is making
an abnormal
sound. Indoor unit electronic expansion
valve opening faulty. When a relevant indoor unit or
another indoor unit performs the
heating operation, the indoor unit
discharge temperature does not
become high and the high
pressure becomes low. When the electronic expansion
valve is open excessively, a loud
refrigerant rushing sound may be
generated.
Indoor unit electronic expansion
valve opening faulty.
Discharge
temperature is
high.
Up - down (left - right) swing
switching motor faulty.
Louver does not move even when
a voltage (DC12V) is applied to
the CN10 terminals (across 1-2)
at swing input.
For the left - right swing switching
motor, check the voltage across
the CN11 terminals (1-2).
Discharge
temperature is
high. Liquid injection solenoid valve
(SV1) faulty.
When a voltage (AC220V) is
applied to CN7, the liquid
injection solenoid valve outlet
pipe is not cold. When SV1 is faulty, the
discharge gas temperature may
rise and a discharge temperature
error may be generated.
Coil resistance : 1200~1500
High pressure gas bypass
solenoid valve (SV2) faulty.
When a voltage (AC220V) is
applied to CN8, the high
pressure gas bypass solenoid
outlet pipe is not warm.
When SV2 is faulty, the high
pressure may rise and a high
pressure error may be generated.
Coil resistance : 1200~1500
Compressor
error Oil return solenoid valve (SV3,
SV4, SV5, SV6) faulty. When a voltage (AC220V) is
applied to CN9, CN10, CN11,
and CN12, the outlet pipe of the
respective solenoid valve (SV3,
SV4, SV5, SV6) does not
become hot. When SV3, SV4, SV5, and SV6
do not operate normally, the oil
may not return to the compressor
and compressor trouble may
occur.
High pressure
is high.
High pressure switch faulty.
There is a voltage difference
across terminals 1-2 of CN42
even though the high pressure
exceeds 3.0MPa.
Error display
(Outdoor
unit error) Error display
(Discharge,
liquid pipe
pressure
sensor error)
Error display
(Outdoor
unit error) High pressure
is high. Pressure sensor (HP, MP) faulty. Measure the pressure sensor
output voltage (across terminals
2-3 of CN33 and CN34) and
compare the result to the
pressure gauge indication. When the pressure sensor is
faulty, protection control is not
entered even if the high pressure
rises and a high pressure error
may be generated.
Refer to the service manual
(section 8-5-2) for the pressure
and pressure sensor output
voltage relationship.
Remakes
Remakes
Remakes
Remakes
When the pressure switch is
faulty, protection control will not
be entered even if the high
pressure rises and a high
pressure error may be generated.
Coil resistance : 1200~1500
Remarks
Check method
(Error state check method)
Cause
Cooling operation.
Fully open (open excessively)
Symptom that
can occur other
than title
Body
LED
Fully open (open excessively)
Cooling stopped.
Fully open (open excessively)
Heating operation.
Fully open (open excessively)
Heating stopped.