1-65
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 lower than
0.6MPa (6kgf/cm
2
G) for an hour.
Alarm
Code
Activation to Protect System from Excessively Low Discharge Pressure
(for Protection of Refrigerant Shortage)
Is the amount of refrigerant
correct?
Correctly charge refrigerant.
No
0.1
Check the outdoor unit PCB1 by
self-checking. Replace it if faulty.
Yes
Is the high-pressure in the
alarm area?
Check for leakage of refrigerant.
No
Yes
Is the connector CN7 of
outdoor unit PCB1 loose?
Plug the connector CN7 correctly.
No
Yes
Is the high-pressure sensor
pipe clogged?
Is voltage between #1 and #3 of
the connector CN7 of outdoor unit
PCB1 12V, and voltage between
#2 and #3 in the alarm area?
Remove clogging.
No
No
Yes
Replace the high-pressure sensor.
Yes
Connect pressure gauge
at the check joint of the
compressor discharge pipe.
0.3
0.6
0.9
(MPa) (V)
Discharge
Pressure
Voltage between
#2 and #3 of CN7
Alarm area
0
Outdoor Air Temperature (
o
C)
26
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