If a Samsung dishwasher shows **UC**, the verified Samsung meaning in this research set is **abnormal / excessive voltage error**. Use the code to narrow the diagnosis, then confirm the exact model because code scope can change by product generation or region. A display code is evidence from the control system, not a component test result. That distinction matters because a connector, supply condition, obstruction, or feedback signal can mimic a failed component. The recorded display form is **UC**. Search normalization stores it as **UC** while preserving the characters a homeowner actually sees.
Reviewed by Ethan Mercer · Last reviewed August 17, 2026
Written by
Ethan Mercer Appliance Repair Content SpecialistPublished August 17, 2026Updated August 22, 2026Technically reviewed August 17, 2026
Content status:
Verified
Error codeUC
ApplianceDishwasher
Quick answer
Abnormal / excessive voltage error.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so UC may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
If a Samsung dishwasher shows **UC**, the verified Samsung meaning in this research set is **abnormal / excessive voltage error**. Use the code to narrow the diagnosis, then confirm the exact model because code scope can change by product generation or region. A display code is evidence from the control system, not a component test result. That distinction matters because a connector, supply condition, obstruction, or feedback signal can mimic a failed component. The recorded display form is **UC**. Search normalization stores it as **UC** while preserving the characters a homeowner actually sees.
Signs
Symptoms you may notice
While UC is active, the appliance can stop, restart, or refuse a high-load function.
UC can be accompanied by this pattern: the code can appear after a surge, brownout, outage, incorrect supply, or frequency problem.
While UC is active, some models preserve the display even when one required power leg or voltage range is abnormal.
The UC display becomes more meaningful if uC appears during the dishwasher function associated with abnormal / excessive voltage error.
When the UC condition is present, the cycle may stop, drain, fail to fill/heat, or repeat a stage.
Why it happens
Possible causes
varies by model/region — cross-region baseline — Abnormal / excessive voltage error
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
As an external check for UC, confirm the breaker has not tripped and the appliance is connected as specified by Samsung.
For UC, start by doing this: if the event followed an outage or surge, perform only the documented one-time power reset.
As an external check for UC, do not perform live mains-voltage measurements unless qualified.
The next non-invasive check is to stop if breakers trip repeatedly, plugs/outlets overheat, or there is arcing.
A safe owner-level check is to record the code before resetting.
A safe owner-level check is to verify water supply, drain path/filter, door, detergent/suds, and visible leaks only when relevant.
Important safety warning. Stop use for active leakage near electrical parts, burning smell, or repeated breaker trips. Do not defeat leak or door-safety switches. For UC, stop troubleshooting immediately if the symptom crosses into a safety hazard rather than a normal diagnostic condition.
Get help
When to request repair service
Once UC has returned after the safe checks, Persistent power/voltage codes need the household supply and appliance power/control circuits checked safely before parts are replaced. Preserve any accompanying noise, water level, temperature, or operating-stage details for the technician.
Book your repair
Seeing this code on your Samsung appliance?
Book a specialist visit for a clear estimate and approval before any repair.
You can try the one reset Samsung documents for the model, but **UC** returning afterward means the condition still exists. Note the operating stage instead of cycling power repeatedly.
Continue only if the appliance is otherwise safe and the owner-level checks are appropriate. Stop for leakage near electrical parts, smoke, burning odor, arcing, gas concerns, repeated breaker trips, uncontrolled heating, or unsafe temperatures.
Treat **UC** as a starting point, not a replacement instruction. Wiring, feedback signals, operating conditions, and electronic controls can mimic a failed component.
The same-looking code can be reused on another Samsung appliance family or reformatted by region/model year. Match the appliance type and exact model before applying a meaning. This page therefore keeps **Dishwasher UC** separate from same-looking codes used by other Samsung appliance families.
