You may have noticed some water formation or maybe even a layer of ice on the rear interior wall of your refrigerator. This effect is what we call condensation and in today’s post we will explain this occurrence and what you can do about it.

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The first thing to note is that this instance: water or a layer of ice on the rear interior wall of a fridge is not unusual – in fact, water formation on a fridge’s back wall is a completely normal physical process. Water tends to condense and collect at the coldest point. And that is because cold air can hold less moisture than warm air. In fridges, water condenses on the rear interior wall because this is where the evaporator is located – and it’s the evaporator that extracts the heat from the interior.

Which appliances are affected?

Moisture and ice appear on the rear walls of fridges that feature a rear wall evaporator with no vertical partition plate. But this does not mean there is no condensation for appliances with vertical partition plates. What makes it different is that the formation of moisture droplets is concealed by the partition and is therefore not visible.

Do water and ice indicate a problem with the appliance?

Certainly not. Water accumulation on the rear wall is completely normal, but there should only be a few drops or a thin film of water. If water accumulates in the condensation drainage channel, the drainage channel could be blocked. In this case, it is advisable to carefully clean the channel to allow the condensate to drain freely. Information on how to do this yourself can be found in the user manual of your Liebherr appliance.

How to prevent ice and condensation on the rear interior wall?

How much water or ice forms on the inner wall is determined by the following factors:

• High ambient temperatures

If the ambient temperature is high, the compressor has to run longer to maintain the required temperature in the fridge. This may occasionally result in ice formation.

• Low thermostat setting

If the temperature thermostat is set too low, the air in the fridge can absorb less moisture, increasing moisture formation at the coldest point (the rear wall). In addition, for the refrigerator to provide more cooling power, the compressor has to run longer. This reduces the time when the fridge is not actively refrigerating in relation to the compressor’s running time, leaving less time for the condensate on the rear wall to drain into the drainage channel.

• Wet food items

If you store water-rich foods (e.g. fruit, vegetables, fish, meat, dairy products) or still-warm dishes in the main refrigerator compartment, the foods will release a lot of moisture into the interior atmosphere. This moisture will collect on the rear wall as condensate. We suggest that you don’t put warm food in the fridge rather wait until it has cooled down completely. Otherwise, if your refrigerator is equipped with BioFresh, use the HydroSafe/DrySafe compartments for an ideal climate storage for all varieties of food.

• Frequent opening of the door

Frequent opening and closing of the door allows heat and moisture to get into the fridge. This requires the compressor to work long and hard to return the interior temperature to its desired level. If the compressor has to run for a long time, ice may form on the inner wall of the fridge.

• Door seal is not airtight

If the water is draining correctly and yet the rear wall is still icy or there is an obvious formation of puddles of water, it might be that the door seal is not airtight. Warm air outside the fridge can absorb more moisture than the cold air inside the fridge. A small hole in the door seal will continually allow warm air and moisture into the fridge, which will condense or form as ice on the inner wall.

• Tropicalized fridges and freezers

Luckily this occurrence is greatly countered with Liebherr’s specialised technology implemented on the tropicalized units. Which is mainly engineered to cater to the Asia Pacific market. To learn more about Liebherr’s tropicalized units, please read our blog article: 5 things about tropicalized fridges and freezers

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