E251
Samsung
Compressor Position / Inverter Error (BLDC Compressor)
E251 appears; unit may not start compressor.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Faulty inverter PCB, Shorted compressor, Loose compressor connector, Incorrect phase output from inverter
How to Fix / Troubleshooting
Danger: Inverter-driven compressors operate at high voltage and frequency. Do not attempt live testing without proper training and equipment.
- Step 1 – Power reset: Turn off power for 10–15 minutes to allow the inverter to discharge. Restore power and test.
- Step 2 – Visual inspection: With power OFF, inspect the compressor wiring harness and connectors for burns or looseness.
- Step 3 – Listen for compressor start: If the outdoor fan runs but the compressor never starts and E251 appears, suspect inverter or compressor failure.
- Technician required: Diagnosis of inverter boards and compressor windings requires specialized meters and procedures. Do not attempt to open the sealed compressor circuit.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter PCB
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