Door-ajar indicator or letter “d” appears on the Gladiator freezer display and an alarm sounds even when the door appears closed.

Safety First: Do not slam the door; glass containers inside may break. Unplug the unit before testing the door switch electrically.

• Step 1 – Check for obstructions: Inspect shelves, baskets, and tall items that may be preventing the door from closing fully. Rearrange contents so the door closes freely.
• Step 2 – Inspect gasket and alignment: Look for gaps between the door gasket and cabinet. If the door is sagging, adjust the door hinges by loosening the hinge screws slightly, lifting the door, and retightening.
• Step 3 – Test door switch: Locate the door switch (usually at the top or side of the liner). Press it in by hand; the interior light should turn off and the alarm should stop after a few seconds. If not, the switch may be defective.
• Step 4 – Replace door switch if needed: Unplug the freezer, pry the switch out gently, disconnect the wires, and install a new Gladiator-compatible door switch, reconnecting wires to the same terminals.