Troubleshooting
Samsung Electronics 4-93
4-4-59 : Comp. Down by Compression Ratio Control
1.
Cause of problem
Ye s
Are the 4Way Valve normally
operating?
Are the Indoor Unit and Outdoor
Unit EEV normally operating?
Is current of compressor normally?
Complete
Commissioning
Replace defective sensor
Check the 4Way Valve
Check the relevant EEV
Compressor Inspection
Check the refrigerant
Ye s
Ye s
No
Is the S-net estimated value and the
Manifold Gauge value in range?
Connect S-net and Manifold Gauge.
(essential requirement)
No
No
No
No
Outdoor unit display
Indoorunit display
×(Operation) ስ (Reservation) ስ (Blast) ስ (Filter) ×(Defrost)
Judgment Method
 When compression ratio (high pressure+1)/(low pressure+1) less than 1.5 and lasts for 10 minutes or more
 Differential pressure (high pressure - low pressure) less than 0.4 MPa.g and lasts for 10 minutes or more
Cause of problem
 Indoor and Outdoor EEV breakdown
 4Way Valve breakdown
 High and Low pressure sensor defective
 Refrigerant shortage
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