Error code reference

Samsung Air Conditioner Error Code E202

Communication error between indoor and outdoor units (communication error on all indoor units, outdoor unit communication cable error).

SourceSamsung Air Conditioner - Service Manual: Indoor Unit (AM Series)p. 4-49

Diagnostic procedure

The full E202 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
Remove communication cable and measure 2 cables of outdoor unit with scope for DC±0.7V square wave.

SourceSamsung System Air Conditioner Indoor Unit - Full Service Manual (AM FN Series)p. 4-29

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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