Error code reference

Samsung Air Conditioner Error Code E191

No temperature changes in EVA OUT during pipe inspection or changes in temperature seen in indoor unit with wrong address.

SourceSamsung DVM S2 Air Conditioner Outdoor Unit - Service Manual (AM072-AM240HCV)p. 81

Diagnostic procedure

The full E191 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 the indoor unit ADDRESS is same as the set ADDRESS on MCU; check the MCU indoor unit setting switch.

SourceSamsung Air Conditioner - Service Manual: PCB Setup & Troubleshooting (AVXDSH036EE)p. 4-23, 4-48

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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