Samsung Washing Machine Error Code UC
The washer detected voltage that is too high, too low, or unstable, and stopped to protect its electronics. The problem is usually with the supply, not the washer.
Also shown as: 9C1, 9E1
Common causes
- Voltage fluctuation or brownout
- Washer plugged into an unstable circuit or extension lead
- Faulty wall outlet
What to check, in order
- Unplug the washer, wait a few minutes, and plug it directly into a wall outlet.
- Avoid running the washer during storms or known power problems.
- If the code appears often with no supply issues at home, the board's voltage sensing may be faulty.
Clear the code and test
- Fix what the checks above found first — a filter cleaned, a hose straightened, taps opened. Clearing the code without fixing the cause only brings it back.
- Close the door, plug the machine back in and restore the water supply.
- Run a short rinse and spin, or the shortest wash programme, and watch the stage where the code appeared before (filling, washing, draining or spinning).
- If the cycle finishes with no code, the fault is cleared. If the code returns at the same stage, write down the code and that stage before calling a technician — it speeds up the diagnosis.
When to call a professional
Most cases are solved by the checks above. Book a technician if any of these apply:
- The code comes back after you have run the checks and a test cycle.
- You smell burning, see sparks or scorch marks, or the breaker trips.
- Water is leaking and you cannot stop it at the tap.
- The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.
When you call, give the brand, the code UC, your model number (on a label inside the door or on the back) and the checks you already ran. It shortens the visit.
Parts that may be involved
Main control board
Parts are model-specific. Find your model number first — usually on a label inside the door, on the door frame or on the back — and match the part to that number before ordering.
Questions people ask about UC
What does UC mean on a Samsung washing machine?
UC means: Power supply voltage problem. The washer detected voltage that is too high, too low, or unstable, and stopped to protect its electronics. The problem is usually with the supply, not the washer.
Can I fix Samsung UC myself?
Start yourself: the checks on this page cover the causes you can reach without opening the machine up. If they point to a faulty part, testing or replacing it is usually a technician job.
How do I clear Samsung UC?
Fix the cause first — clearing the code on its own brings it straight back. Then restore power and water, run the shortest programme, and watch the stage where the code appeared. If the programme finishes with no code, it is cleared.
Sources checked
- Samsung support: washing machine information codes
- Samsung support: dishwasher information codes
- Samsung support (US): dishwasher troubleshooting
The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.