Remote
controller
Indoor
unit
Outdoor
unit
Normal
display
Normal
display
Normal
display
The electronic expansion valve
opening of indoor unit is 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
Abnormal sound
is heard from
indoor unit.
Frost may form
on the surface
of the heat ex-
changer of the
relevant indoor
unit.
Discharge
temperature is
high.
Up/down (left/right) swing
switching motor is faulty.
Up/down louver does not move
even when a voltage (DC12V)
is applied to the terminal of CN10.
(for wall mounted and ceiling wall
type: CN6). Check the voltage
across the terminal.
For the left - right swing switching
motor, check the voltage across
the terminal of CN11. (for wall
mounted and ceiling wall type:
CN7).
Error display
(Outdoor
unit error)
Error display
(Discharge
sensor error)
Error display
(Outdoor
unit error)
The operation
of the ourdoor
unit is abnormal.
Pressure sensor (HP, LP)
are faulty.
Measure the pressure sensors
output voltage (between terminals
2 and 3 of CN33 and CN34) and
compare the result with the
pressure gauge indication.
When the pressure sensors are
faulty, compressor steps and
protection control will not
be conducted properly.
Refer to 7-2-2 to find the correl-
ation between pressure and
and output voltage of the sensor.
Remakes
Remarks
Check method
(Error state check method)
Cause
Symptom that
can occur other
than title
Body
LED
05-45
The area (heat exchanger) near
the air diffuser is cool even after
several minutes have elapsed
since the relevant indoor unit was
stopped. (the gas pipe of the re-
levant indoor unit remains cold).
Electronic expansion valve
opening of the relevant indoor
unit is out of control (open
excessively) during heating
operation.
Electronic expansion valve
opening of the relevant indoor
unit is out of control (open
excessively) when the indoor
unit stop heating operation.
The temperatuer of air flow as
well as inlet pipe of the electronic
expansion valve of the relevant
indoor unit is higher than those of
other indoor units.
The temperatuer of inlet pipe of
the electronic expansion valve
do not become low.
Discharge
temperature is
high.
Liquid injection solenoid valve
(SV1) is faulty.
When a voltage (AC220-240V) 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) is faulty.
When a voltage (AC220-240V) 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) is faulty.
When a voltage (AC220-240V) 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 is faulty.
There is a voltage difference
across terminals 1-2 of CN42
even though the high pressure
exceeds 3.0MPa.
Remakes
Remakes
Remakes
When the pressure switch is
faulty, protection control will not
be performed even if the high
pressure rises and a high
pressure error may be generated.
Coil resistance : 1200~1500
The cooling ca-
pacities of in-
door units
except for the
relevant indoor
unit are insuffi-
cient. Abnorm-
al sound is hea-
rd from indoor
unit.
Electronic expansion valve
opening of the relevant indoor
unit is out of control (open
excessively) during cooling
operation.
Electronic expansion valve
opening of the relevant indoor
unit is out of control (open
excessively) after stopping
cooling operation.
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.
If the electronic expansion valve
of the stopping indoor unit re-
mains open, frost may form on
the surface of the heat exchanger
of the indoor unit and water leak-
age or other trouble may occur.
Turn off the power source of PCB
of the indoor unit to initialize the
electronic expansion valves for
several times. Put a 3-minute in-
terval between each initializations.
The electronic expansion valve
may return to normal.
The heating ca-
pacities of in-
door units
except for the
relevant indoor
unit are insuffi-
cient.
Abnormal sound
is heard from
indoor unit.
Turn off the power source of PCB
of the indoor unit to initialize the
electronic expansion valves for
several times. Put a 3-minute in-
terval between each initializations.
The electronic expansion valve
may return to normal.
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