Separate heat from display
Tell us whether the zone had just been used or was cold before the indication appeared. Do not touch the surface to establish its temperature.
Copy the actual symbol
A residual-heat letter and a fault message are not interchangeable. The complete display and model allow an engineer to consider an indicator complaint alongside the zone's ordinary operation.
A useful distinction
A symbol appearing after an outage should be recorded with that history. Its persistence while the appliance is unused may need interpretation, but touching the glass is not an appropriate way to verify the display.