E428 : Comp. Down By Compression Ratio Control - Samsung AM007FN1DCH/AA Service Manual

Troubleshooting
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?
4-98
(Reservation) (Blast)
Commissioning
Yes
operating?
Yes
No
Yes
Complete
(Filter) ×(Defrost)
Connect S-net and Manifold Gauge.
No
No
No
No
(essential requirement)
Replace defective sensor
Check the 4Way Valve
Check the relevant EEV
Compressor Inspection
Check the refrigerant
Samsung Electronics