Troubleshooting
Samsung Electronics 4-99
4-4-55 : Comp. Down due to Low Pressure Protection Control
Indoorunit display
Cause of problem
×(Operation) ስ (Reservation) ስ (Blast) ስ (Filter) ×(Defrost)
Refri gerant shortage
Electr onic expansion valve blocked
Service valve blocked
Low pressure sensor defective
Leakage of compressor discharge check valve of not-
go-end out door 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)
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
Outdoor unit display
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 refri
gerant 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 Serv
ice 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
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