Troubleshooting Sub Zero Refrigerators: What to Do When the Compressor Clicks

A clicking noise coming from your Sub Zero refrigerator’s compressor can be alarming. This sound often signals that something is wrong with the compressor or its related components. Ignoring this issue can lead to more serious problems, including complete compressor failure and costly repairs. Understanding why the compressor clicks and how to address it can save you time and money.

Sub Zero refrigerator compressor showing wiring and components

Why Does the Compressor Make Clicking Noises?

The compressor is the heart of your refrigerator’s cooling system. It pumps refrigerant through the coils to keep your food cold. When the compressor clicks, it usually means it is trying to start but fails to do so properly. Common reasons include:

• Electrical issues: Faulty wiring, a bad start relay, or a failing capacitor can cause the compressor to click repeatedly.

• Overheating: If the compressor overheats, a built-in overload protector may shut it off temporarily, causing clicking sounds.

• Mechanical failure: Internal damage or wear in the compressor can prevent it from running smoothly.

• Blocked or dirty condenser coils: This can cause the compressor to work harder and overheat.

• Low refrigerant levels: A leak or insufficient refrigerant can cause the compressor to cycle on and off, producing clicking noises.

  
  

How to Diagnose the Clicking Compressor

Before calling a technician, you can perform some basic checks to narrow down the cause:

1. Unplug the refrigerator and inspect the compressor area for visible damage or burnt wiring.

2. Check the start relay and capacitor. These parts help the compressor start. If they are faulty, the compressor will click but not run.

3. Clean the condenser coils if they are dusty or clogged. Dirty coils reduce cooling efficiency and strain the compressor.

4. Listen carefully to the clicking pattern. Rapid clicking often points to electrical issues, while slower clicks may indicate overheating.

5. Feel the compressor. If it is hot to the touch, it may be overheating and shutting off repeatedly.

   
   

If you are comfortable with electrical components, you can test the start relay and capacitor with a multimeter. Otherwise, it is safer to call a professional.

Steps to Fix a Clicking Compressor

Once you identify the likely cause, you can take the following actions:

• Replace the start relay or capacitor if they are faulty. These parts are relatively inexpensive and easy to replace.

• Clean the condenser coils thoroughly using a coil brush or vacuum. This improves airflow and reduces compressor strain.

• Check for refrigerant leaks. Low refrigerant requires a certified technician to repair and recharge the system.

• Ensure proper ventilation around the refrigerator. Poor airflow can cause the compressor to overheat.

• Call a professional if the compressor itself shows signs of mechanical failure. Compressor replacement is complex and costly.

  
  

Technician inspecting Sub Zero refrigerator compressor with diagnostic tools

Preventing Compressor Clicking in the Future

Preventive maintenance can keep your Sub Zero refrigerator running smoothly and avoid clicking noises:

• Regularly clean condenser coils every 6 months to prevent dust buildup.

• Keep the refrigerator well ventilated with at least a few inches of clearance around it.

• Avoid overloading the fridge which can cause the compressor to work harder.

• Check door seals to ensure cold air stays inside and the compressor does not run excessively.

• Schedule annual professional maintenance to inspect electrical components and refrigerant levels.

  
  

When to Call a Professional

If you have tried basic troubleshooting and the clicking noise continues, it is time to contact a qualified appliance repair technician. Signs you need professional help include:

• The compressor does not start at all.

• The clicking noise is loud and persistent.

• The refrigerator is not cooling properly.

• You notice burning smells or visible damage near the compressor.

• You are uncomfortable working with electrical parts.

  
  

A professional can safely diagnose and fix complex compressor problems, ensuring your Sub Zero refrigerator works reliably.