RemarksCause
Remote
controller
Indoor
unit
Outdoor
unit
Normal
display
Normal
display
Normal
display
Indoor electronic expansion
valve opening is faulty.
Coil resistance (red-white,
red-orange, brown-blue,
brown-yellow) : 100~200 .
The cooling ca-
pacities of in-
door units
except for the
relevant indoor
unit are insuffi-
cient.
Electronic expansion valve
opening of the relevant indoor
unit is out of control (open
excessively) during cooling
operation.
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)
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.
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.
Frost may form
on the surface
of the heat ex-
changer of the
relevant indoor
unit.
Electronic expansion valve
opening of the relevant indoor
unit is out of control (open exces-
sively) during heating operation.
System does
not cool / heat
Installed piping is unsuitable.
Liquid piping diameter is
incorrect.
Check the indoor unit capacity
and pipe diameter.
When the diameter is large, a
refrigerant rushing sound will be
generated and when the
diameter is small, capacity will
be insufficient.
Check method
(Error state check method)
Symptom that
can occur other
than title
Body
LED
05-43
Electronic expansion valve
opening of the relevant indoor
unit is out of control (open
excessively) after stopping
cooling 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.
Solenoid valves (SVB1,2) of RB
unit are faulty.
Outdoor heat exchanger
switching 4-way valves (4WV2,
4WV3, 4WV4) or solenoid valves
(SV7, SV8) are faulty.
Check the heat exchanger opera-
tion capacity at the LED on the
outdoor control PCB (Refer to
section 5-2).
Check the energized state
(AC220-240V) of the heat ex-
changer 4-way valve and solen-
oid valves.
Check the temperature of the
pipes connecting these valves.
When a 4-way valves or solenoid
valves are faulty, the high pres-
sure rises during the cooling op-
eration and the low pressure
drops during the heating opera-
tion.
Coil resistance : 1200~1500
When heating operation starts, a
voltage (AC220-240V) is applied
to indoor unit control PCB CN6 [in
the cases of wall mounted and
ceilling wall type indoor units
CN5] (across terminals 3-4), but
3 minutes later a loud refrigerant
rushing sound is generated from
the RB unit.
(1)Check the voltage.
(2)Disconnect the plug from PCB
and check the coil resistance:
Coil resistance :
1,200 ~ 1,500 .
Bteween terminal 3(white) and
4(red).
The heating ca-
pacities of in-
door units
except for the
relevant indoor
unit are insuffi-
cient.
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.
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 inlet pipe of
the electronic expansion valve
do not become low.
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