Refrigerators make all sorts of different noises while operating. Most of the time, this isn’t something to be worried about unless the noise is loud. One of the noises that indicates a more serious problem is a loud knocking noise coming from your fridge.
If you can hear a loud knocking noise, you will need to inspect the evaporator fan, the condenser fan, and the compressor, as these are the most likely causes of the problem if they have become faulty.
Before you check those components, make sure that the problem is not being caused by anything in your fridge knocking into the wall of the fridge when the compressor is working. You should also make sure that your fridge is sitting level on the kitchen floor.
If those two simple fixes don’t work, you’ll need to check the internal components.
The purpose of the evaporator fan in your refrigerator is to distribute cold air around your fridge. When it becomes faulty or blocked from rotating around properly, your fridge will not be able to cool down, and the fan might make a knocking sound.
The easiest way to check if the evaporator fan is causing the problem is to see if your fridge is warm and isn’t cooling properly. If this is the case, this means the evaporator fan isn’t working.
To check the evaporator fan:
If the knocking noise is coming from the back of your fridge, it is most likely being caused by a faulty condenser fan. The purpose of the condenser fan is to help cool the condenser coils. When it doesn’t work, the coils will overheat, and your fridge won’t cool. It can also cause a knocking noise because the fan can come into contact with ice or hit another object at the back of the fridge.
To test the condenser fan, there are a few steps you need to take:
The final component to check is the compressor. The compressor is the main component in your fridge that helps to make it operate correctly, as it distributes refrigerant around your fridge.
If your compressor becomes faulty, you may hear a knocking sound coming from it. Replacing a compressor is very expensive, so you’re probably better off buying a new fridge. They are also difficult to repair, and any repairs should only be carried out by a qualified technician.
However, before calling a technician, turn your fridge off, locate the compressor, and check it over for any signs of loose parts. If you find anything loose, try to tighten it up if possible, and then check if the knocking sound stops. If you can’t find any loose parts, you will need to call a technician or purchase a new fridge.
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