1-64
TROUBLESHOOTING
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the compressor is operated under the conditions higher than
2.65 MPa (26.5 kg/cm
2
G) of discharge pressure [ in case of FSG, FSG1 and FXG models, Pd is
higher than 2.84 MPa (28.4 kg/cm
2
G)] and its occurrence is more than 3 times including 3 in one
hour.
Alarm
Code
Is the high-pressure sensor good?
Yes
Are ex. valves fully closed and
locked?
Check if indoor or outdoor intake
air temperature is too high.
Check the circuit board and
connection of the circuit board
connector. Replace the electronic
expansion valves if faulty.
In the case of H-LINK connection,
check the refrigeration cycle setting on
the PCB of outdoor unit and indoor unit.
Check connection of the circuit
board connector. Replace the
high-pressure sensor if faulty.
Open the stop valve.
No
Is there a leakage of the
solenoid valves SVA?
Replace the solenoid valve SVA
if faulty.
No
No
Yes
Are electric wiring and refrigerant
piping between the indoor and
outdoor unit incorrectly connected?
Is the outdoor unit stop valve
closed?
No
No
Yes
Yes
Correctly connect it.
Check the outdoor electronic expansion valve during cooling
and the indoor electronic expansion valve during heating.
Yes
Activation to Protect System from Excessively High Discharge Pressure
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Excessively
High Discharge
Pressure
Check stop valve.
Open stop valve.
Closed Stop Valve
Check outlet temp. of
solenoid valve, SVA.
Check connection.
Replace solenoid valve
SVA if faulty.
Leakage of Solenoid Valve
SVA (Outdoor Unit)
Check thermistor for
indoor unit and outdoor
unit inlet air temp.
Replace thermistor
if faulty.
Excessively High Indoor
Unit and Outdoor Unit
Inlet Air Temp.
Check connectors for
PCB.
Replace pressure
sensor if faulty.
Abnormal High Pressure
Sensor
Check electrical system
and ref. cycle.
Correctly connect.
Incorrect Connection between
Indoor Unit and Outdoor Unit
Check connector for
PCB.
<FX Series Only>
Repair connector for
PCB or ex. valve.
Replace it if faulty.
Locked Ex. Valve with
Fully Closed
Check solenoid valve
SVD1 opening in
heating.
Replace coil or
CH unit if faulty.
Fully Closed Solenoid
Valve SVD1 (CH Unit)
Stoppage of
Indoor Fan
<Wall Type Only>
Check continuity of fuses.
Replace fuses.
Melted Fuses
Replace PCB and
check operation.
Replace PCB
if faulty.
Faulty PCB
