Samsung AM072FXVAFH series - E428: Suspension of Starting by Abnormal Compression Ratio

Troubleshooting
4-80 Samsung Electronics
1.
How to check
Complete
Check the 4Way Valve
Replace defective sensor
No
No
Yes
Yes
Are the 4Way Valve normally operating?
Is the S-net estimated value
and the Manifold Gauge value in range?
Check the relevant EEV
No
No
Are the Indoor Unit and Outdoor Unit EEV
normally operating?
Compressor Inspection
Check the refrigerant
No
Yes
Is current of compressor normally?
Auto Trial Operation
Replace defective sensor
4-4-35 : Suspension of starting by abnormal compression ratio
Outdoor unit display
Indoorunit display
Judgment Method
 Compression ratio [(High pressure+1.03)/(Low pressure+1.03)] 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
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation Defrost TimerFan Filter/MPI Operation Defrost Timer FilterOperation TimerTurbo
××◑◑◑×◑◑◑
● ◑◑
※ ● : ON ◑ : Flash ×: OFF