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Error code reference

Samsung Air Conditioner Error Code E428

Compressor operation stop due to abnormal compression ratio (high/low pressure ratio less than 1.5 for 10+ min or differential less than 0.4 MPa.g for 10+ min).

SourceSamsung System Air Conditioner Indoor Unit - Full Service Manual (AM FN Series)p. 4-30, 4-89

Samsung codesSamsung air conditioner codes
Diagnostic procedure

The full E428 procedure

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MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Connect S-net and Manifold Gauge; check sensor values; check 4Way Valve; check EEV; check compressor current; check refrigerant.

SourceSamsung System Air Conditioner Indoor Unit - Full Service Manual (AM FN Series)p. 4-30, 4-89

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More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented

9 manuals in the MyPros+ library document this code for Samsung air conditioner.

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