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.
Frigidaire refrigerator knocking noise.
The condenser fan motor runs at the same time as the evaporator motor and the compressor.
There could be problems if a sound is too loud goes on too long or repeats too often.
Unless the fan assembly breaks this is simply a mechanical phenomenon that you can live with.
You can usually trace the sound to its source and decide whether to fix it yourself or call an appliance pro.
Disconnect your refrigerator from the power source and then remove the rear access panel.
Some refrigerators make knocking noises when cycling on or off as the fan begins to spin or stop.
Over time mineral deposits can accumulate inside the valve and restrict the water flow.
The water inlet valve is an electrically controlled valve that opens to supply water to the refrigerator dispenser and icemaker.
Water hammer is a knocking or banging noise in a water line that occurs when the water valve opens and closes.
If the refrigerator is noisy or loud particularly when the ice maker is filling the water inlet valve might be at fault.
Also as a general rule an older refrigerator will make more noise than a newer unit.
If you own a frigidaire that is making a knocking sound it could be the result of a couple of different causes.
You may need to open the freezer door to clearly hear if the noise is inside or outside.
In addition to noise your fridge might not be staying as cool as normal and or may be turning on and off regularly.
How to inspect a refrigerator condenser fan motor.
Listen carefully to determine whether the knocking noise is coming from the inside or outside of the freezer.
Skip to step 3 if the sound is on the outside or coming from behind the freezer.
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.
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A typical refrigerator can last up to 20 years.