Troubleshooting
Samsung Electronics 4-75
4-4-32 : Comp. Down due to Low Pressure Protection Control
1.
How to check
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.)
Chec
k the refrigerant amount.
Is there any leakage in
the Liquid Pipe Valve or the Discharge
check valve leaking on outdoor unit that is off
when only some Outdoor Units
are operating?
Auto Trial Operation
Open the Service Valv
e
Replace Low Pressure sensor
Check the relevant EEV
Pipe inspection
Replace relevant component
Yes
Yes
Yes
Are all service valves open?
Connect S-net and Manifold Gauge.
(essential requirement)
No
No
No
Yes
Yes
No
Outdoor unit display
(
Air Cooled
)
Indoorunit display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation
Defrost TimerFan Filter/MPI
Operation
Defrost Timer Filter
Operation
TimerTurbo
××◑◑◑×◑◑◑
●
◑◑
※ ● :
ON
◑ :
Flash
×:
OFF
Judgment Method
Judgment Method : Inspection when the value of low pressure sensor is 1.8kg//cm², or less for air conditioning and
0.8kg//cm² for heating
Cause of problem
Refrigerant shortage
Electronic expansion valve blocked
Service valve blocked
Low pressure sensor defective
Discharge check valve leaking on outdoor unit that is off
Error may be found when used in te
mperature 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)
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