Error code reference

Samsung Heat Pump Error Code Cx

Electronic expansion valve open error for xth indoor unit - stopped indoor unit inlet/outlet temperature below 0°C for 2.5 minutes in cooling.

SourceSamsung Heat Pump - Troubleshooting Guide: Outdoor Unit Error Codes (RMAH140GAM0SER)p. 182, 206

Samsung codes Samsung heat pump codes

Diagnostic procedure

The full Cx 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

First diagnostic step

Check EEV wire connection to indoor unit PCB; check EEV coil insertion; press reset key (K3) to recheck.

SourceSamsung Heat Pump - Troubleshooting Guide: Outdoor Unit Error Codes (RMAH140GAM0SER)p. 182, 206

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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 heat pump.

Models covered by the manuals that document this code

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The full Cx procedure

Where this code is documented

Models covered by the manuals that document this code

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