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Error code reference
Samsung Heat Pump Error Code E221
Outdoor temperature sensor OPEN/SHORT error.
SourceSamsung Heat Pump - Service Manual: Troubleshooting (RVMH100FAM0G)p. 219, 242
Diagnostic procedure
The full E221 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 sensor connector is separated from PCB; measure resistance and compare to table.
SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMBH020CA0XAG)p. 219, 242
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
2 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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