Samsung AM056FN2DEH Series - Comp. down Due to Low Pressure Protection Control

Troubleshooting
Samsung Electronics 477
4-4-57 : Comp. Down due to Low Pressure Protection Control
Is the S-net
estimated value and the Manifold
Gauge value in range?
Are the Indoor Unit and Outdoor
Unit EEV normally operating?
Are there any blockage inside
the pipe? (filter etc.)
Check the refrigerant amount.
Is there any leakage in
the Liquid Pipe Valve or the discharge check
valve of the not-go-end Outdoor Unit when
only some Outdoor Units
are operating?
Commissioning
Open the Service Valve
Replace Low Pressure sensor
Check the relevant EEV
Pipe inspection
Replace relevant component
Yes
Yes
Yes
No
Are all service valves open?
Connect S-net and Manifold Gauge.
(essential requirement)
No
No
No
Yes
Yes
1.
Cause of problem
No
Outdoor unit display
Indoor unit display
Criteria
 Inspection when the value of low pressure sensor is 0.8kg/cm², or less for air conditioning and 0.6kg/cm² for heating.
Cause of problem
 Refrigerant shortage
 Electronic expansion valve blocked
 Service valve blocked
 Low pressure sensor defective
 Leakage of compressor discharge check valve of not-go-end outdoor unit
 Error may be found when used in temperature range outside the conditions of use
(Operating outside temperature at -20°C or less for heating and operating outside temperature at -5°C or less for
Cooling)