Why Is Your Sub-Zero Making Strange Noises?
Decoding the sounds your refrigerator makes
Sub-Zero refrigerators are engineered for near-silent operation. So, when your appliance starts making unusual sounds, it can be concerning. Some noises are a normal part of operation, but others can signal a problem. Let's break down why your Sub-Zero is making noise and what to do about it.
Normal Operating Noises
Not all sounds are a sign of trouble. You might hear:
- A faint hum: The compressor and fans running.
- Gurgling or bubbling: Refrigerant circulating through the system.
- Clicks: Internal components expanding and contracting with temperature changes, or the defrost timer operating.
- Hissing: Water from the defrost cycle dripping onto the defrost heater.
Noises to Pay Attention To
If you hear the following sounds, they may indicate a problem:
1. Loud Humming or Vibrating
If the normal hum becomes loud or is accompanied by vibration, it could mean the refrigerator isn't level. It can also be a sign of a worn-out compressor or fan motor.
What to do: Check if the unit is level. If the noise is coming from a fan, something might be obstructing its blades. If the compressor is humming loudly, it's best to call a specialist.
2. Grinding or Squealing
These sounds often point to a failing motor in one of the fans (evaporator or condenser). Worn-out bearings can produce a high-pitched squeal.
What to do: This is a clear sign that a component is about to fail. Don't delay the repair, as a broken fan will lead to overheating or poor cooling. The motor needs to be replaced.
3. Frequent or Loud Clicking
While some clicking is normal, frequent and loud clicks could indicate a problem with the compressor's start relay. It might be trying, and failing, to start the compressor.
What to do: If the clicking is accompanied by cooling problems, it's a serious reason to call a technician.
4. Banging or Knocking Sounds
A knocking sound could indicate that the condenser fan blades are hitting something, or that the compressor has an internal mechanical problem.
What to do: Unplug the refrigerator and inspect the fan. If it's clear and the noise continues, the problem is likely with the compressor, which requires professional diagnosis.
Don't Ignore the Warning Signs
Strange noises are your Sub-Zero's way of telling you there's a problem. A timely response can prevent a more expensive repair down the road. If you're unsure about the cause of a noise, the local repair pros for luxury appliances in Milpitas are here to help.