While the most likely reason for a refrigerator to make a knocking sound is the compressor the condenser fan might also cause a fridge banging noise.
Frigidaire refrigerator making knocking sound.
If the door begins to make a popping noise when you open and close it.
Gurgling sound in the door.
First check out the evaporator fan blade in the freezer behind the back panel.
This may occur if the fan becomes clogged with lint or other debris which reduces air flow and makes a clicking knocking or whistling sound.
Your frigidaire refrigerator door has a small notched plastic ring that surrounds the hinge pin and helps to close the door.
It s probably the circulation fan which pushes air through the freezer and fridge sections of your appliance.
Unless the fan assembly breaks this is simply a mechanical phenomenon that you can live with.
A boiling gurgling or knocking sound can be heard when the unit is running.
Hear a noise inside the refrigerator that sounds like a squeak or rattle.
Some refrigerators make knocking noises when cycling on or off as the fan begins to spin or stop.
Help my frigidaire fridge is making a loud popping noise.
This sound can be heard just after the door is closed because of the water in drain tube trap area.
This is caused by the circulation of refrigerant.