Samsung DVM S ECO BIG Series Service Manual page 90

Troubleshooting
■ Phase reversal or phase failure(3Ø outdoor unit wiring, R-S-T-N),
connection error on 3 phase input. (E-428)
Auto Trial Operation
Is the S -net estimated
value and the manifold
Gauge value in range?
Are the 4Way Valve
normally operating ?
Are the indoor unit and
outdoor unit EEV
normally operating?
Is current of
compressor normally?
4-48
Yes
Yes
No
Yes
Complete
Connect S -net and Manifold Gauge.
(essential requirement)
No
Replace defective sensor
No
Check the 4Way Valve
No
Check the relevant EEV
No
Compressor inspection
Check the refrigerant
Samsung Electronics