Written by
Adrian Soto Appliance Repair Content SpecialistPublished September 5, 2026Updated October 20, 2026
Error codeUnderlined u (u)
ApplianceCooktop
Quick answer
Underlined u is a Pan Detection Error on induction cooktops. Check the pan size, material and position.
Model compatibility: Samsung reuses codes across series and model years, so Underlined u (u) 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: the cookware is unsuitable by size, material or placement.
The underlined u code (often typed as plain u) is Samsung’s Pan Detection Error, and only induction cooktops show it. Samsung explains the symbol as a pot bottom sitting over a surface.
What triggers it
Cookware that is wrong in size, in material or in placement on the element brings up the code, and the pan does not heat. Left uncorrected, the element shuts off after 1 minute.
What to check
How the pan size compares with the element
What the pan is made of
Where the pan sits on the element
Related cooktop codes
UP reports a cooktop out of normal voltage, and d0 is a stuck button error.
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.
