Error code reference

Samsung Heat Pump Error Code Bx

Electronic expansion valve open error (x = indoor unit address) - stopped indoor unit inlet/outlet temperature below 0°C in cooling.

SourceSamsung Heat Pump - Service Manual: Troubleshooting (RVMH100FAM0G)p. 182, 206

Samsung codes Samsung heat pump codes

Diagnostic procedure

The full Bx 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).

SourceSamsung Heat Pump - Service Manual: Troubleshooting (RVMH100FAM0G)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 Bx procedure

Where this code is documented

Models covered by the manuals that document this code

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