Hello Johannson;
My name is Peter. I am a retired field service refrigeration technician.
Every 8-10 hours your unit goes through a defrost mode. This is where everything shuts down with the exception of your lights and your defrost heater turns one. The defrost heater will turn on for about 20-30 minutes to defrost the cooling coils (evaporator) behind the back wall of your freezer.
Your defrost heater is generally a black steel bar about 3/8" in diameter. It is located beneath the freezer cooling coils. The sound that you hear is the condensate dropping off the cooling coils and hitting the hot defrost bar.
Everything is good. This is how your unit is suppose to work.
Hi,
The sizzling in your case means that it is working....it is just water dripping from the cooling coil onto the hot element that defrosts it...
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heatman101
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