Samsung Washer UC Error Code — What It Means
The UC error code on a Samsung washer indicates the machine has detected an unstable or abnormal supply voltage. This is a power-related fault, not a drain or load-balancing issue (Samsung uses a separate Ur code for unbalanced loads). The washer is warning you that it cannot maintain a stable voltage long enough to run normally, which can be caused by voltage that is too low, too high, intermittent, or interrupted by wiring and connection problems between your outlet and the machine.
Common Causes
- Extension cords, power strips, or adapters Any device between the washer and the wall outlet can create voltage drop or instability under load.
- Loose, worn, or failing wall outlet The receptacle may not be making good contact or may drop voltage when the washer draws current.
- House power fluctuation Brownouts, surges, or unstable utility supply can trigger the code.
- Damaged power cord or plug Cracks, fraying, or bent prongs interrupt clean power delivery to the machine.
- Loose internal wiring or harness connections Vibration over time can loosen connectors inside the cabinet.
- Main control board fault If the supply is proven good, the board itself may be misreading or unable to regulate voltage properly.
Step-by-Step Fix
- Unplug the washer or turn off the circuit breaker for at least one minute, then restore power to clear any temporary glitch.
- Confirm the washer is plugged directly into a dedicated wall outlet. Remove any extension cords, power strips, adapters, or smart plugs.
- Inspect the plug and receptacle for discoloration, melting, heat marks, looseness, or mechanical damage, and replace the outlet if you find any.
- Measure the line voltage at the receptacle with a multimeter while the washer is plugged in and running (or under load from another appliance) to verify you are getting stable 110–120 V in the U.S. or 220–240 V internationally.
- Check the power cord and internal harness for cuts, pinches, or loose terminals, and inspect the cabinet interior for any disconnected or corroded connectors.
- Test with a different known-good outlet on a separate circuit if available to rule out house wiring issues.
- Replace the main control board if the supply side checks out and the error persists after reconnecting all harnesses firmly.
Parts Often Needed
| Part | Notes |
|---|---|
| Samsung washer main control board / PCB | Amazon | Match the part number to your exact model (one common example is DC92-017, but verify yours before ordering). |
| Appliance power cord | Amazon | Must match the plug configuration and amperage rating for your washer model. |
| Wall receptacle / outlet | Amazon | Use a properly rated and grounded outlet (15 or 20 amp) on a dedicated circuit. |
When to Call a Pro
Call a professional if you are uncomfortable working with live voltage or opening the washer cabinet. An appliance technician or electrician should also be called if you measure unstable or incorrect voltage at the outlet, if the outlet or circuit shows signs of heat damage or arcing, or if the error returns after you have confirmed good supply power and reseated all internal connectors. Control board diagnosis and replacement requires care to avoid further damage, so if you are unsure after the supply checks, bring in a qualified repair technician.