What Causes a Fridge to Sweat or Condensate Inside?

Finding moisture or water droplets inside your fridge can be concerning, but in many cases it has a simple cause and an easy fix. Here's what causes condensation inside a fridge and how to address it.

Normal vs Abnormal Condensation

A small amount of moisture inside a fridge is normal, particularly after you've recently opened and closed the door, added warm food, or during humid summer weather. What you're looking for is persistent moisture that doesn't dry out or pools of water forming inside the fridge compartment.

Common Causes

1. Door Left Open or Not Closing Properly

The most common cause. Warm, humid room air enters the fridge and condenses when it meets the cold interior. Check that the door is closing fully and that nothing is preventing it from sealing. A door left slightly ajar by a tall bottle or bulging shelf can cause significant moisture build-up.

2. Worn or Damaged Door Seal

The rubber gasket around the door creates an airtight seal. Over time, this gasket can crack, warp or pull away from the door. To test: close the door on a piece of paper. If you can pull the paper out easily, the seal needs replacing. Replacement gaskets are available from most appliance suppliers.

3. High Humidity Inside the Fridge

Storing uncovered foods — particularly fruits, vegetables and freshly cooked dishes — releases moisture into the fridge interior. Store foods in sealed containers to reduce this.

4. Warm Food Placed Inside

Putting hot or warm food directly into the fridge releases steam that condenses on colder surfaces. Allow food to cool to room temperature before refrigerating.

5. Blocked or Dirty Drainage Hole

Fridges have a small drainage hole at the back of the fridge compartment that channels defrost water down to an evaporation tray. If this hole is blocked by food debris, water pools inside rather than draining. Clear it with a cotton bud or a pipe cleaner.

6. Temperature Set Too Low

If your fridge is set too cold, the temperature differential between the fridge interior and door areas can cause condensation. The recommended fridge temperature is 3–4°C.

When to Call a Technician

If you've addressed all the above and moisture continues to build up, the issue may be a faulty defrost system, a refrigerant leak or a failing compressor. These require professional diagnosis and repair.

Upgrading Your Fridge

If your fridge is older than 10–12 years and experiencing recurring condensation issues, it may be more cost-effective to replace it. Browse our range of modern, energy-efficient fridges at Oceania Appliances with free delivery across Sydney.