Condensation or moisture on exterior cabinet or around door gaskets.

Safety first: No internal electrical work is required for basic checks.

Usage and environment:

• Reduce frequency and duration of door openings.
• Ensure the room is not excessively humid; use a dehumidifier if necessary.

Gasket and heater checks:

• Inspect door gaskets for gaps or tears and replace if needed.
• On models with a heated mullion between doors, verify the heater is operating (slightly warm to the touch when running). If cold and condensation is heavy, the heater circuit may need professional diagnosis.