First, check that the source of the glow is not condensed moisture on the underside of the lid. See

Next, turn the power switch fully to the On position. If the whole area of the orange lid glows a fuzzy yellow-orange, you will need to call Vernier’s Tech Support team to arrange a repair or a replacement for the lid.

If you are comfortable with removing and replacing the lid with a Phillips screwdriver, a replacement lid can be sent. If not, we can arrange to have the whole unit returned for repairs.