Condensation or frost forming on door gaskets and mullion between doors.

Safety first: No electrical work is required for basic checks. Unplug the unit if accessing heater wiring.

Step 1 – Inspect and clean gaskets:

• Wipe gaskets with warm soapy water and dry.
• Check for tears, gaps, or hardened sections; replace the door gasket if damaged.

Step 2 – Verify door closure and alignment:

• Ensure doors close fully and are not obstructed by food items.
• Adjust leveling legs to tilt the unit slightly back.

Step 3 – Mullion heater check:

• Some models have an energy saver switch that turns the mullion heater off; turn it ON if condensation is present.
• If condensation persists with heater on, the mullion heater may be faulty and require replacement.

When to call a technician: For heater replacement or door realignment beyond basic leveling, professional service is recommended.