E428 : Comp. Down By Compression Ratio Control - Samsung AM009FN1DCH/AA Service Manual

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