Samsung Electronics 63
3-25. Phase reversal or phase failure(3Ø outdoor unit wiring, R-S-T-N),
connection error on 3 phase input. (E-428) (cont.)
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?
Complete.
Connect S-net and Manifold Gauge.
(essential requirement)
Replace defective sensor.
Check the 4Way Valve.
Check the relevant EEV.
Compressor inspection
Check the refrigerant.
Yes
No
Yes
Yes
Yes
No
No
No
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