LG Range or Cooktop Hot-Surface Warning Missing: Safe Checks Before Service

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Keep hands, children, and heat-sensitive items away from the cooking surface. From outside the appliance, note whether a surface element or zone was recently used, whether any control still shows an active setting, and whether the warning is absent; do not touch the glass or use water to test its temperature.

   Expected result: A zone was recently used or is still selected, but no HS, H, or residual-heat indication is visible; no zone was used recently; or the surface is of unknown thermal state.

   Next step: Treat the surface as hot until it has cooled under the exact model instructions. If the warning was absent after recent use, do not resume cooking on the affected surface and continue with model and service checks.

   Why this matters

   Why: A recently used or uncertain surface remains a burn hazard even when the indicator is dark. An unused, cooled surface does not establish that the indicator circuit is healthy during operation.

2. Check 2

   Identify the appliance from its rating label and record the complete LG model suffix. Confirm whether it is a radiant electric range, a radiant or induction cooktop, or a gas model, and compare the control symbol or display with the exact model's owner information; do not assume that every LG oven or range uses the same HS display.

   Expected result: The model documentation explicitly lists a hot-surface or residual-heat indicator; it lists a different symbol or control arrangement; or the model cannot be read.

   Next step: Use only the matching model documentation for the expected indication. If the model or appliance type cannot be confirmed, stop at safe external observation and arrange LG or qualified appliance service rather than diagnosing a failed lamp or sensor.

   Why this matters

   Why: An indicator can be expected on one LG model and implemented differently on another. LG's opened product pages show a radiant range with multiple hot-surface indicators and an induction cooktop with residual-heat indication, while the task does not identify which family is present.

3. Check 3

   With all controls off and without touching the surface, record the display state and any error message or flashing indicator. Compare only the observed symbol with the exact LG model support information; do not enter a service mode, remove a panel, or perform live electrical measurements.

   Expected result: The panel shows an error, no warning appears after a documented hot-surface event, the warning remains after the surface is known to be cool, or the display is normal but the model's manual expects a warning.

   Next step: Photograph the display and provide the exact model and symptom to service. Keep the cooktop out of use if the warning is missing during a condition in which the matching manual says it should appear, and do not bypass the indicator or open the control area.

   Why this matters

   Why: An error or a model-confirmed missing safety indication needs model-specific diagnosis. LG separately states that HS is not an error code and gives a service boundary when the indication does not turn off at room temperature; that guidance does not authorize a user to repair the indicator when it is absent.

4. Check 4

   Check the surrounding glass and controls from a safe distance for a crack, liquid intrusion, scorch mark, melted control, or other visible damage. Do not wipe across a hot surface, pour liquid on it, or continue testing a damaged cooktop.

   Expected result: The glass or control area is damaged; liquid has entered the controls; there is an odor, smoke, sparking, or repeated electrical trip; or there is no visible damage.

   Next step: Stop use and isolate power only if it is safe to do so when damage, smoke, sparking, or repeated tripping is present, then arrange qualified appliance or electrical service. For an intact but non-indicating surface, keep it unused and provide the model details to service.

   Why this matters

   Why: Visible damage or an electrical warning increases the risk beyond a missing display and cannot be safely separated from the indicator issue by external testing. No visible damage does not prove that the warning circuit works.

5. Check 5

   Prepare a service handoff with the complete model and serial information, appliance type, which zone was used, whether the warning was ever seen, the display or error text, and whether the surface was still warm when the warning was absent. Do not repeatedly heat the surface just to reproduce the complaint.

   Expected result: The warning failure is repeatable after normal use; it occurs only on one zone; it occurs across the whole appliance; or it cannot be reproduced safely.

   Next step: Keep the affected cooktop out of service until the exact model's safety indication is assessed. If the symptom cannot be reproduced without heating the surface, do not create another heat cycle; give service the recorded circumstances instead.

   Why this matters

   Why: The pattern helps the technician distinguish a zone-specific indication from a control-wide issue, but it does not identify a sensor, lamp, board, or wiring fault for the user.