1-66
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 a suction pressure is lower than 0.02 MPa (0.2 kg/cm
2
G) for over
12 minutes and its state occurs more than 3 times including 3 in one hour.
Alarm
Code
Activation to Protect System from Excessively Low Suction Pressure
(Protection from Vacuum Operation)
Is the amount of refrigerant correctly?
Yes
Yes
Is the outdoor stop valve open?
Is refrigerant leaking?
Check if connections of electric wiring
and refrigerant piping between the indoor
and outdoor unit are wrong.
Check the indoor ex. valve during cooling
and the outdoor ex. valve during heating.
Open the stop valve.
Correctly charge refrigerant.
Repair leaks.
No
No
Yes
Is suction pressure sensor normal?
Replace suction pressure sensor
if faulty.
No
No
Yes
Are the electronic ex. valves fully
closed and locked?
Check connection of the connectors
and the circuit board. Replace the
electronic ex. valves if faulty.
No
Yes
NOTE:
In the case of H-LINK system, check the refrigerant
system setting of the outdoor PCB and indoor PCB.
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Check for conduction
after temperature of
outdoor fan motor is
decreased.
Faulty
Internal
Thermostat
Replace outdoor fan
motor.
Fault
Measure resistance
by tester.
Remove looseness
and replace connector.
Incorrect
Contact
Check connection. Connect correctly.
Incorrect
Connection
Excessively
Low Suction
Pressure
(in Vacuum)
Internal
Thermostat for
Outdoor Fan
is Activated
in Heating
Operation
Measure coil resistance
and insulation resistance.
Replace outdoor fan
motor if faulty.
Faulty Outdoor Fan Motor
Check ref. charged
volume or check for
leakage.
Repair leakage and
correctly charge.
Shortage of Ref.
Check electrical
system and ref. cycle.
Correctly connect
between indoor unit
and outdoor unit.
Incorrect Connection
between Indoor Unit and
Outdoor Unit
Check connector
for PCB.
Repair or replace
connector of PCB or
ex. valve.
Locked Ex. Valve
Check connector
for PCB.
Replace pressure
sensor if faulty.
Abnormal Low or High
Pressure Sensor
Check stop valve. Open stop valve.Closed Stop Valve
Check Td thermistors
for compressors and
measure Td thermistor
resistance.
Repair or replace
Td thermistor.
Closed Ex. Valve by
Disconnecting Td Thermistor
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