E410 : Comp. Down Due To Low Pressure Protection Control - Samsung AM072/096/120/144FXVAFH Service Manual

4-4-32 : Comp. Down due to Low Pressure Protection Control
Outdoor unit display
Operation Defrost
Indoorunit display
※ ● : ON ◑ : Flash × : OFF
∙ Judgment Method : Inspection when the value of low pressure sensor is 1.8kg//cm², or less for air conditioning and
Judgment Method
0.8kg//cm² for heating
∙ Refrigerant shortage
∙ Electronic expansion valve blocked
∙ Service valve blocked
Cause of problem ∙ 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)
1. How to check
Auto Trial Operation
Are all service valves open?
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.)
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?
Check the refrigerant amount.
Samsung Electronics
( Air Cooled)
Duct, Cassette (1/2 Way),Console, Celing
Timer Fan Filter/MPI Operation Defrost
× × ◑ ◑ ◑
Yes
Yes
Yes
No
Cassette (4/Mini4 Way)
Timer Filter Operation
× ◑ ◑ ◑
Connect S-net and Manifold Gauge.
(essential requirement)
No
Open the Service Valve
No
Replace Low Pressure sensor
No
Check the relevant EEV
Yes
Pipe inspection
Yes
Replace relevant component
Troubleshooting
Wall-mounted (NeoForte)
Timer Turbo
● ◑ ◑
4-75