Written by
Nadia Okafor Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeunderlined u, u, UNDERLINEDU
ApplianceCooktop
The underlined u symbol
Look for a small u with a line beneath it, often typed as a plain u. Samsung calls it the Pan Detection Error and says only induction cooktops show it. The symbol is described as a pot bottom above a surface.
Why it appears
Cookware of the wrong size, the wrong material, or placed badly on the element triggers it. The pan will not heat while the code shows, and if nothing changes the element switches off after 1 minute.
Samsung induction cooktop service in San Francisco
If the pan is fine yet the symbol stays, Samsung cooktop repair lists what we handle in San Francisco and the wider Bay Area; the phone is (415) 969-6153. Have the model number and the pan details you checked ready.
Model compatibility: Samsung reuses codes across series and model years, so underlined u, u, 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
Underlined u is a pan detection error on induction cooktops caused by unsuitable cookware.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Samsung appliance?
Book a specialist visit for a clear estimate and approval before any repair.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
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Book a repair online or call us — clear estimates and approval before any repair work begins.
