Error code reference

Samsung Air Conditioner Error Code E251

Condenser temperature sensor error (short/open) - error level: over 4.9V (-50°C) or under 0.4V (93°C). Also covers compressor discharge temperature sensor error.

SourceSamsung Air Conditioner - Full Service Manual: Free Joint Multi Series (MH/NJ Models)p. 3-5, 9-8

Diagnostic procedure

The full E251 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
Turn off system and replace related sensor.

SourceSamsung Air Conditioner - Full Service Manual: Free Joint Multi Series (MH/NJ Models)p. 3-5, 9-8

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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