E410 : Comp. Down Due To Low Pressure Protection Control - Samsung AM007FN1DCH/AA Service Manual

Troubleshooting
4-4-55 : Comp. Down due to Low Pressure Protection Control
Outdoor unit display
Indoorunit display
×(Operation)
Judgment Method ∙ Inspection when the value of low pressure sensor is 0.8kg//cm², or less for air conditioning and 0.6kg//cm² for heating
∙ Refrigerant shortage
∙ Electronic expansion valve blocked
∙ Service valve blocked
Cause of problem
∙ 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)
1. Cause of problem
Are all service valves open?
estimated value and the Manifold
Are the Indoor Unit and Outdoor
Unit EEV normally operating?
Are there any blockage inside
the Liquid Pipe Valve or the discharge check
valve of the not-go-end Outdoor Unit when
Check the refrigerant amount.
4-94
(Reservation)
Commissioning
Yes
Is the S-net
Gauge value in range?
Yes
Yes
the pipe? (filter etc.)
No
Is there any leakage in
only some Outdoor Units
are operating?
No
(Blast) (Filter) ×(Defrost)
No
No
No
Yes
Yes
Connect S-net and Manifold Gauge.
(essential requirement)
Open the Service Valve
Replace Low Pressure sensor
Check the relevant EEV
Pipe inspection
Replace relevant component
Samsung Electronics