Samsung AM038KXWDCH, Service Manual, Page: 119 / 295

Samsung Electronics 116
Troubleshooting
4-3-32 : Comp. Down due to Low Pressure Protection Control
1. Cause of problem
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 leaking on outdoor unit that is off when
only some Outdoor Units
are operating?
Auto Trial Operation
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
No
Outdoor unit
display
( Water Cooled )
Indoorunit
display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation Defrost Timer Fan Filter/MPI Operation Defrost Timer Filter Operation Timer Turbo
× × ◑ ◑ ◑ × ◑ ◑ ◑ ● ◑ ◑
※ ● : 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 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)
4-3 Appropriate Measures for Different Symptom (cont.)