Error code reference

Samsung Air Conditioner Error Code E458

Over voltage detected in compressor current (CT) sensor - CT sensor value over 20A for 3 minutes or more. Also indicates electrical malfunctions of outdoor machine on RD040/050 model.

SourceSamsung Air Conditioner - Service Manual: PCB Option Code Configuration (RD075VRXFA)p. 4-83, 4-121

Diagnostic procedure

The full E458 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check if there is any problem with compressor and check for electric leakage on connecting wire.

SourceSamsung Air Conditioner - Service Manual: PCB Option Code Configuration (RD075VRXFA)p. 4-83, 4-121

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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