Samsung AVXC1H022 series Service Manual page 256

I
: Compressor Down by Low Pressure Protection Control
Outdoor unit display
Indoor unit display
Judgment method
Causes
1. Check Method
Samsung Electronics
(Operation)
Detect when the low pressure sensor value is under 2.6kg/cm
when the value is under 1.4kg/cm
Insufficient refrigerant / EV clogging / Service valve clogging / Compressor unloading defect /
Low pressure sensor defect / Compressor Discharge Check Valve leakage of the outdoor unit
on the stop side
If use at the temperature that is far from the using condition (start when outside temperature is
below -20°C during heating operation and when outside temperature is below -5°C during
cooling operation), the relevant error can be occurred.
Test operation
Is the service valve opened all?
Yes
Is the measuring value of
S-net same as the value of the
Manifold Gauge?
Yes
Are the indoor unit and
outdoor unit EEV
operated normally?
Yes
Is there any clogged part in a piping
(Filter, etc.)?
No
Is there any leakage
on the liquid valve of the outdoor unit
on the stop side or the emission Check
Valve during some outdoor units are
operated only?
No
Check the amount of refrigerant
(Timer) (Fan) (Filter)
2 during heating operation.
No
No
No
Yes
Yes
Troubleshooting
(Defrost)
2 during cooling operation and
Connect the S-net and Manifold
Gauge (Requisite)
Open the service valve.
Replace the low pressure
sensor.
Check the relevant EEV.
Check the pipe.
Replace the relevant parts.
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