Samsung Cooktop underlined u: What the Display Means
Samsung Cooktop code **underlined u** is associated with **pan detection error on induction cooktops**. The display identifies the system or condition the control detected, but it does not by itself prove which individual part should be replaced. 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 **underlined u**. Search normalization stores it as **UNDERLINEDU** 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 codeUNDERLINEDU
ApplianceCooktop
Quick answer
Pan detection error on induction cooktops.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so UNDERLINEDU 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
Samsung Cooktop code **underlined u** is associated with **pan detection error on induction cooktops**. The display identifies the system or condition the control detected, but it does not by itself prove which individual part should be replaced. 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 **underlined u**. Search normalization stores it as **UNDERLINEDU** while preserving the characters a homeowner actually sees.
Signs
Symptoms you may notice
While underlined u is active, the display appears while the appliance is otherwise able to respond as expected.
A symptom that fits underlined u is that the message can be tied to a mode, test, reminder, setup state, or protective condition rather than a failed part.
Depending on the exact model, normal operation can resume after the documented mode or condition is cleared.
underlined u can be accompanied by this pattern: underlined u appears on the display while the appliance reports: Pan detection error on induction cooktops.
Why it happens
Possible causes
varies by model/region — cross-region baseline — Pan detection error on induction cooktops
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 underlined u, confirm the exact display characters and appliance model before treating the message as an issue.
Before requesting service for underlined u, verify the user-facing setting, mode, door, filter, container, or setup condition named by Samsung for this display.
Before opening any service area, use the model-specific manual to clear the status; avoid repeated resets if the message returns unexpectedly.
For underlined u, start by doing this: record the exact code and model number.
To rule out an accessible cause, check door/divider/pan placement, vent obstruction, settings, and household power only when relevant.
Before requesting service for underlined u, do not perform live high-voltage internal testing; request service if the code reappears.
Important safety warning. Safety takes priority over clearing underlined u. Stop for cracked glass, arcing, repeated breaker trips, overheating, or damaged wiring. Do not access live induction power electronics.
Get help
When to request repair service
Service is not automatically required. Request diagnosis only if the status cannot be cleared as designed or normal operation does not resume. A repeatable underlined u event is more useful diagnostically than repeated resets, because it shows when the pan detection error on induction cooktops check is failing.
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 **underlined u** returning afterward means the condition still exists. Note the operating stage instead of cycling power repeatedly.
This entry is classified as a status, reminder, test, or diagnostic state in the cited Samsung documentation. Normal use is appropriate only when the model instructions confirm the state and the appliance behaves normally.
Not automatically. Samsung error codes are diagnostic indicators, not part numbers. Confirm the circuit around **underlined u** before replacing anything.
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 **Cooktop underlined u** separate from same-looking codes used by other Samsung appliance families.
