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Quick answer
A Samsung induction cooktop will not detect a pan when the base is not magnetic, is too small for the selected zone, or is not centered. Test a flat, induction-compatible pan with water in it, centered on the zone; an empty pan may make the induction element shut off. On Samsung's US error-code guide, an underlined lowercase u identifies a pan-detection error and the element can turn off after about one minute if the condition is not corrected. If the same known-compatible water-filled pan works on another zone but not the affected one, stop using that zone and request Samsung service.

Work through in order
Diagnostic checks
Use only checks that match the exact appliance or system and its official guide.
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Check 1
With the surface cool and your hands dry, select the affected zone once and record what appears: no response, an underlined lowercase u or other pan symbol, a code, or a zone that starts and then stops. Note whether the same symptom affects one zone or every zone.
Expected result: An underlined lowercase u appears, the zone gives a pan-detection indication, the display is different on each zone, or no zone recognizes cookware.
Next step: Photograph the display, record the exact model and affected zone, and continue with a known-compatible pan. If smoke, sparks, burning smell, cracked glass, uncontrolled heat, liquid near electrical parts, or repeated breaker trips are present, stop using the cooktop.
Why this matters
Why: Samsung's US range and cooktop error guide uses an underlined lowercase u for a pan-detection error on induction cooktops; a display that differs by zone is useful evidence for model-specific support rather than proof of a universal code.
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Check 2
Check the pan itself without heating it: place a magnet against the underside, inspect that the base is flat and intact, and compare its magnetic base diameter with the cooking-zone size listed in the exact model manual. Set aside pans made only from nonmagnetic aluminum, copper, glass, or ceramic unless the manufacturer labels them as induction-compatible.
Expected result: The magnet does not hold, the base is warped or damaged, the magnetic area is smaller than the zone requirement, or the pan is labeled for induction and has a flat magnetic base.
Next step: Use a clean, flat pan confirmed for induction and sized for the zone. Do not slide heavy or rough cookware across the glass; lift and place it.
Why this matters
Why: Samsung says induction cookware needs a magnetic base and that cookware size must fit the burner; its FAQ also calls out pans that are too small. A pan that fails the magnet or size check is a cookware mismatch, not evidence that the cooktop sensor has failed.
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Check 3
Place the confirmed pan in the center of the affected zone, add water, select the zone, and set a low or moderate level within the model's normal operating instructions. Keep the test brief and do not test an empty pan.
Expected result: The pan is detected and the water warms, the pan remains undetected, or the zone starts and then turns off.
Next step: If the pan is still rejected, reposition it once and verify the manual's size requirement. If the water does not get hot with a known-compatible pan, turn the zone off and use the comparison check before requesting service.
Why this matters
Why: Samsung explains that induction elements can shut off when cookware is not magnetic or when it is empty; a water-filled test avoids mistaking that automatic behavior for a pan-detection failure. Centering and a suitable size also matter.
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Check 4
Using the same confirmed pan and the same water-filled test, compare the affected zone with one other zone that is the same model's supported size. Record whether the panel response, pan symbol, and heating result change with the zone.
Expected result: The pan heats on another zone but not the affected zone, or no zone detects the same pan.
Next step: Turn both controls off and stop using a zone that repeatedly rejects the confirmed pan. Provide Samsung with the affected zone, the comparison result, pan material and size, and any display symbol.
Why this matters
Why: A successful test elsewhere makes the pan and its placement less likely to be the cause and supports a localized zone, sensor, or control-path problem. Failure on every zone keeps cookware, model settings, or a broader cooktop fault in consideration.
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Check 5
If the display shows an underlined lowercase u, correct the pan's material, size, or placement and observe the zone for the next minute rather than repeatedly restarting it.
Expected result: The indication clears and the pan heats, or the indication remains and the element turns off after about one minute.
Next step: If a correctly sized magnetic pan still produces the symbol, stop testing that zone and request model-specific service. Do not enter a service mode or open the cooktop.
Why this matters
Why: Samsung's US error-code guide says this symbol is a pan-detection error and that an unresolved unsuitable-pan condition can turn the element off after one minute. The timed shutoff is a documented detection branch, not permission to bypass a persistent error.
Use your observations
Decision map
Find the observation that best matches what you see, then follow the next safe action.
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PATH 01Next step
What you see
The magnet does not hold, the pan is visibly warped, or the pan is too small for the selected zone.
Do this next
Use a flat, magnetic, induction-labeled pan that meets the exact model's size guidance, center it, and repeat the water-filled test once.
Why this path and its safety boundary
Why it matters: The observed no-detection result is consistent with cookware compatibility or fit rather than a confirmed cooktop fault.
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PATH 02Next step
What you see
A known-compatible water-filled pan heats on another zone but the affected zone shows a pan indication or remains inactive.
Do this next
Stop using the affected zone and request Samsung service with the zone, model, pan test, and display details; do not remove the glass or attempt coil or sensor repair.
Why this path and its safety boundary
Why it matters: The pan has passed a functional comparison, so a repeatable single-zone detection or control-path fault is more likely.
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PATH 03Next step
What you see
No zone detects the same confirmed magnetic pan with water, or the cooktop shows a persistent or model-specific code.
Do this next
Turn the cooktop off, keep the display photo, and request Samsung support with the exact model, pan material and size, zone results, and code or symbol.
Why this path and its safety boundary
Why it matters: The result is not isolated to one pan/zone pairing and needs model-specific diagnosis; cookware remains possible if the pan was not actually within the manual's limits.
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PATH 04Next step
What you see
The underlined lowercase u clears after correcting the pan and the water heats normally.
Do this next
Continue only with cookware that meets the exact model's instructions and monitor for a repeatable failure; request service if the same suitable pan is rejected again.
Why this path and its safety boundary
Why it matters: The immediate cause was consistent with Samsung's documented pan-detection conditions, so a component replacement is not justified from this test alone.
Helpful context
Understand the symptom
This symptom is narrower than a completely dead cooktop: the controls may light and respond, but one cooking zone does not recognize the pan. Start by recording whether the message appears on one zone or all zones, and photograph any symbol before changing cookware. Samsung's exact display and minimum pan size can vary by model, so use the model manual for limits not stated here.
Do not judge operation by touching the glass. Use only a cool, intact surface and stop immediately for smoke, sparks, a burning smell, cracked glass, uncontrolled heating, liquid near electrical parts, or a breaker that trips again.
The useful decision is whether the cooktop rejects this pan, rejects every suitable pan, or rejects only one zone. That result separates cookware and placement from a repeatable zone fault without opening the appliance.
When checks do not resolve it
Need a professional?
Request qualified Samsung service when a correctly sized magnetic pan with water is rejected repeatedly, the same pan works on another zone but not the affected zone, no zone detects a confirmed compatible pan, or a code or pan symbol returns after the documented cookware checks. Stop immediately for smoke, sparks, burning smell, cracked glass, uncontrolled heat, liquid near electrical parts, or repeated breaker trips; keep clear and seek qualified electrical or emergency help as appropriate. Do not open the cooktop, test live terminals, bypass safety controls, or keep resetting a tripping breaker.
Common questions
FAQ
Why does my Samsung induction cooktop detect one pan but not another?
The pans may differ in magnetic base, flatness, magnetic-area size, or placement. Test the rejected pan with a magnet and compare its base with the zone guidance in the exact model manual.
Why did the Samsung induction zone turn off while the pan was on it?
Samsung says an induction element can turn off when cookware is unsuitable or empty. Repeat the test with a correctly sized magnetic pan containing water; if that pan still fails, stop using the affected zone and request service.
Is an underlined lowercase u the same as a general cooktop error?
On Samsung's US range and cooktop error-code guide, an underlined lowercase u is specifically a pan-detection error that appears on induction cooktops. Other models or markets may display differently, so confirm the symbol in the exact manual.
Read the exact guide
Official sources
- Samsung Cooktop FAQs | Samsung USASamsung USA · The FAQ answer for Samsung induction cookware detection identifies magnetic base, pan size, and centering as the relevant checks.
- Samsung cooktop cookware breakdownSamsung US · The guide states that induction cookware needs a magnetic base, a flat bottom, and a magnetic portion matching the element size.
- Samsung range or wall oven error codesSamsung US · The underlined lowercase u section explicitly applies to induction cooktops; exact displays can vary by model.
- One burner on the Samsung cooktop does not workSamsung US · The induction-element section requires magnetic cookware, suitable burner size, and a water-boiling test; it directs service if water does not get hot.
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