Sat. Sep 30th, 2023

A Sub-Zero refrigerator’s exceptional attributes include quiet operation, making any loud noises all the rarer. What’s the deal with my Sub-Zero refrigerator freezer being so loud? The freezer evaporator fan may have failed if the refrigerator noise stops when the freezer door is closed. These troubleshooting steps can help you figure out why your Sub-Zero refrigerator freezer is so loud. If you can’t solve the problem yourself, then it’s worth contacting Sub Zero repair service.

While evaporator fan problems are frequently the source of loud Sub-Zero refrigerator freezers, there are other possibilities. However, before we can fix strange sounds, we need to know what sounds are normal in the first place. 

Noises from a Sub-Zero Refrigerator and Freezer

Even if your Sub-Zero refrigerator freezer is quiet, some operational noise is unavoidable.  The following noises are standard Sub-Zero freezer operation, and there’s no need to worry about them:

  • When the compressor and evaporator fan is working properly, you can hear a faint humming sound from the Sub-Zero.
  • When moisture drips on the defrost heater, sizzling and crackling sounds can be heard at various times during the defrost cycle.
  • When ice falls into the ice bin, it makes a loud banging or crashing sound.
  • If your Sub-Zero refrigerator freezer makes noise when the door is closed but not open, it could be due to an evaporator fan problem. Here’s how to fix evaporator fan problems.

Is There an Ice Buildup?

When your Sub-Zero refrigerator makes gurgling noises, it’s usually because the fan is clogged with ice. You can also notice a buildup of ice around the evaporator fan on the freezer’s back panel. Consult your user manual to learn how to remove the back panel on your model freezer to see if the fan is frozen.

Sub-Zero recommends manually defrosting the freezer to melt ice that has formed on or around the evaporator fan. Some refrigerator models allow for manual defrosting of select portions so that the rest of the fridge can continue to function. If this is feasible on your model refrigerator, it will be stated in the user handbook.

Evaporator Fan Motor Fault

Even if the evaporator fan isn’t blocked by ice, your Sub-Zero refrigerator may make loud knocking noises. These noises usually indicate that the fan blades are colliding with something or are damaged. Remove any additional impediments that may be preventing the blades from moving while the evaporator fan is accessible. However, if the blade is damaged or the fan is difficult to turn by hand, it should be replaced by a professional.

Even if the fan blades are working properly, is your Sub-Zero freezer noisy while the door is closed? It’s conceivable that the fan motor isn’t working properly. When your Sub-Zero refrigerator’s fan motor fails, the regular humming noise will become much louder when the door is closed. The fan motor must be changed in this scenario.

Problems with the compressor or condenser in a Sub-Zero refrigerator

If the loud refrigerator noise isn’t caused by the evaporator fan, the problem is most likely with the compressor or condenser. You may also notice that your refrigerator is warm inside and not cooling properly, in addition to the loud noises.

When your Sub-Zero refrigerator freezer is loud, it could be due to one of the following condenser or compressor issues:

  • Condenser coils that are dirty: These coils cool refrigerant to provide cool air for the refrigerator. The condenser may have to work harder and noisier to cool the refrigerator if it becomes coated in dust and filth. Read your refrigerator’s user manual for instructions on how to clean the condenser coils. The majority are hidden behind an upper grille and can be vacuumed with a narrow hose attachment to remove dust and dirt.
  • Condenser fan malfunction: Just like the evaporator fan, the condenser fan can develop problems and blockages that prevent it from working properly. The condenser coils may not cool properly as a result of this. It is necessary to replace the condenser fan if it is noisy or does not rotate properly.
  • When a compressor starts to fail, it will emit a loud humming sound. While it may continue to cool the refrigerator, it should be replaced as soon as possible by a professional.

By Manali