If your refrigerator isn’t staying cold, it’s easy to think the whole unit is broken. But more often than not, the problem comes down to either the compressor or the thermostat. These two parts control cooling and work together to maintain the right temperature. If either stops working, your fridge or freezer may not stay cold. In this post, we’ll help you figure out what’s likely broken, what you can test yourself, and when to call a professional at Appliance Repair Southern California.
How a Refrigerator Cooling System Works
Most refrigerators work by using a closed system of refrigerant that moves heat out of the fridge and freezer compartments. Here’s how:
- The thermostat senses the temperature and tells the system to cool.
- The compressor pumps refrigerant through the coils.
- The refrigerant absorbs heat from inside and releases it outside through the back or bottom.
If either the thermostat or the compressor stops working, the cooling process fails.
Signs Your Thermostat May Be the Problem
A broken thermostat won’t send the right signal to the compressor. Here are some signs:
- The fridge isn’t cold, but the compressor isn’t running at all.
- The temperature keeps changing, even though you haven’t adjusted the dial.
- You turn the control knob, but nothing happens.
- The interior light works, but there’s no cooling.
DIY tip: Turn the thermostat to a colder setting and listen for a click. If you don’t hear one, the thermostat might be faulty.
Signs Your Compressor May Be the Problem
The compressor is the heart of the cooling system. If it fails, the entire cycle shuts down. Watch for these signs:
- You hear buzzing or clicking, but the fridge stays warm.
- The compressor runs hot to the touch.
- The fan works, but no cold air comes out.
- There is a loud hum that stops suddenly.
These issues often show up in older fridges or after power surges. You can learn more about refrigerator repair in Southern California here.
Troubleshooting Tips: Thermostat vs Compressor
Want to do a few safe checks before calling for help? Start here:
- Unplug and reset the fridge. Wait five minutes and plug it back in.
- Adjust the thermostat dial. Listen for a click.
- Feel the compressor. If it’s hot and silent, it may be broken.
- Use a multimeter. Check for continuity in the thermostat. No signal means it’s failed.
- Inspect for frost. Heavy frost can cause airflow issues that mimic a thermostat fault.
Avoid guessing when dealing with electrical parts. If you’re unsure, schedule a visit with our appliance repair technicians.
Which Is More Likely to Break First?
Thermostats tend to fail more often than compressors. They have moving parts and wiring that wear out over time. Compressors are more durable but are harder and costlier to replace. A misfiring thermostat can trick you into thinking the compressor is bad.
Modern refrigerators also have control boards. These can sometimes fail and cause thermostat-like symptoms. Always test before replacing parts.
Repair Cost Comparison: Thermostat vs Compressor
Thermostat Replacement
- Average cost: $100 to $250
- Usually a quick fix if diagnosed early
Compressor Replacement
- Average cost: $300 to $650+
- May not be worth it for older appliances
Some brands like GE, Whirlpool, or Bosch have specific parts and repair procedures. If you use those brands, you can explore:
When to Call a Professional
If you’re dealing with electrical issues, sealed systems, or refrigerant, don’t attempt repairs on your own. These systems require training and the right tools. You should book service if:
- You’ve done basic checks and still have no cooling
- The compressor is hot or making strange sounds
- The thermostat dial does nothing
- The fridge keeps tripping your breaker
Emergency appliance repair in Temecula is available if you need help fast.
Preventing Future Issues
- Keep condenser coils clean.
- Avoid overloading the fridge.
- Make sure vents aren’t blocked.
- Check temps with a fridge thermometer.
- Get seasonal maintenance done by professionals.
Small steps go a long way. You can also explore routine care guides to keep your unit running longer.
Final Thoughts
If your fridge isn’t cooling like it used to, don’t guess. A faulty thermostat or compressor can lead to food loss and high energy bills. Try safe DIY checks, but leave deeper issues to the pros. At Appliance Repair Southern California, we help families across the region get cold storage working again. Book your repair today and get peace of mind back in your kitchen.
Looking for related help? See our guide on refrigerator water leaks and freezer defrost issues.
FAQs: Compressor vs Thermostat
How do I know if my fridge compressor is working?
Put your hand on the back. If it vibrates or hums slightly, it’s working. No noise means it might be broken.
Can a faulty thermostat ruin a compressor?
Yes. If it keeps telling the compressor to run nonstop, it can overheat and fail.
Should I fix the compressor or buy a new fridge?
If your fridge is over 10 years old, a replacement might make more sense than replacing the compressor.
Can I replace the thermostat myself?
Some models make this easy. But always unplug the fridge and follow safety steps. If unsure, call a technician.
Why is my fridge running but not cooling?
It could be a faulty thermostat, clogged coils, or a failing compressor.
Eric
Eric is the founder and lead repair expert at Appliance Repair Southern California. With 17+ years of experience, he has built a reputation for providing fast, reliable, and high-quality repair services across Southern California. His expertise covers a wide range of appliances, including refrigerators, ovens, dishwashers, and washing machines. Eric is committed to exceptional customer service and ensuring every repair is done right the first time. Under his leadership, Appliance Repair Southern California continues to be a trusted name in the industry.
