How to Tell if a Refrigerator Compressor is Bad

Expert insights from Sergey, Master Technician at Appliance EMT

If your refrigerator is still running but your drinks aren’t as cold as they used to be, food is spoiling faster, or items in the freezer are beginning to soften, it’s reasonable to wonder whether the compressor is going bad.

According to Sergey, a Master Technician with Appliance EMT, three symptoms deserve particular attention: unusual noises, excessive heat around the compressor, and a refrigerator that is no longer cooling properly.

But none of those symptoms proves that the compressor itself has failed.

A refrigerator can have similar problems because of a failed fan, start component, airflow restriction, electrical issue, or another problem within the cooling system. That’s why Appliance EMT technicians look at the symptoms together and test the refrigerator before determining that the compressor is bad.

This guide explains the signs of a bad refrigerator compressor, what those symptoms can mean, and how a technician confirms the actual cause.

Key Takeaways

If you’re trying to determine how to tell if a refrigerator compressor is bad, watch for several symptoms occurring together:

• The refrigerator or freezer is getting warmer.
• Frozen foods begin to soften or thaw.
• You hear new or unusually loud sounds from the compressor area.
• The compressor becomes extremely hot while cooling performance gets worse.
• The refrigerator repeatedly clicks or struggles to start.
• The refrigerator runs for long periods without reaching the proper temperature.

The most important point is that these are warning signs, not a diagnosis. Other refrigerator problems can cause many of the same symptoms.

What Does a Refrigerator Compressor Do?

The compressor is a major part of your refrigerator’s sealed cooling system.

Its job is to help move refrigerant through the system so heat can be removed from inside the refrigerator and released outside the appliance.

But the compressor doesn’t work alone.

Refrigerator cooling also depends on components such as the:

• Evaporator
• Condenser
• Evaporator fan
• Condenser fan
• Refrigerant lines
• Temperature sensors and controls
• Compressor start components
• Electronic controls

This is why a refrigerator that stops cooling does not automatically have a bad compressor.

For Sergey, identifying that the refrigerator isn’t cooling is only the first step. The important question is why it isn’t cooling.

Signs a Refrigerator Compressor May Be Failing

The most useful way to recognize possible compressor trouble is to look for changes in how the refrigerator sounds, feels, and cools.

Common refrigerator compressor failure symptoms include:

Loud or Unusual Sounds

A refrigerator compressor normally produces some sound while operating. A low hum is usually normal.

Pay more attention to noises that are new, unusually loud, repetitive, or noticeably different from what you’re used to hearing.

These may include:

• Loud buzzing
• Unusual humming
• Repeated clicking
• Knocking
• Rattling
• Sounds as though the refrigerator is repeatedly trying to start

A new noise becomes more significant when the refrigerator is also having trouble cooling.

However, Sergey points out that not every sound near the compressor actually comes from the compressor. Fans, start components, tubing, vibration, and electrical parts can create similar noises.

The Compressor Is Extremely Hot

Compressors generate heat during normal operation, so a compressor that feels warm or hot is not automatically defective.

Excessive heat becomes more concerning when it happens together with:

• Poor cooling
• Very long run times
• Repeated starting and stopping
• Unusual noises
• Rising refrigerator or freezer temperatures

Possible causes can include restricted airflow, condenser fan problems, electrical issues, start-component problems, refrigeration-system problems, or an internal compressor failure.

Because the compressor area contains hot surfaces and electrical components, homeowners should not remove covers or handle compressor wiring in an attempt to diagnose it themselves.

The Refrigerator Is Running but Not Cooling Properly

Poor cooling is one of the most noticeable bad refrigerator compressor symptoms.

You may notice:

• Drinks aren’t as cold as usual.
• Refrigerated foods feel warmer.
• Food spoils faster.
• Ice cream becomes unusually soft.
• Frozen food begins to thaw.
• Ice takes longer to freeze.
• The refrigerator runs for long periods but doesn’t get cold enough.

The confusing part is that other parts of the refrigerator may still appear to work. If your refrigerator is not cooling even though the light is on, the compressor is only one of several possible causes that should be considered.

The lights may turn on. Fans may run. You may hear the appliance operating.

That tells you there is a cooling problem, but it doesn’t necessarily tell you that the compressor has failed.

Repeated Clicking or Trouble Starting

Repeated clicking can indicate that the compressor is trying but failing to start normally.

However, the compressor itself isn’t the only possible cause.

A technician may also need to evaluate the:

• Start relay or start device
• Overload protector
• Capacitor, when applicable
• Electrical connections
• Electronic controls
• Power supplied to the compressor

A refrigerator compressor not working and a compressor that cannot start because of another failed component can look very similar without proper testing.

The Refrigerator Runs Almost Constantly

A refrigerator can naturally run longer when the kitchen is hot, the doors have been opened frequently, or a large amount of warm food has recently been added.

What is more concerning is a refrigerator that suddenly starts running almost constantly while temperatures continue to rise.

That means the appliance is working hard without producing the expected cooling.

A compressor problem is one possibility, but airflow, condenser, door-seal, refrigerant-system, and other problems can also cause extended run times.

Both the Refrigerator and Freezer Are Getting Warmer

If cooling is declining in both compartments, the entire refrigeration system may need to be evaluated.

Possible causes include:

• Compressor problems
• Refrigerant circulation problems
• Fan or airflow problems
• Condenser cooling problems
• Sensors or controls
• Electrical issues
• Other sealed-system problems

Again, the symptom tells the technician where to investigate. It does not identify the failed component by itself.

Watch: 3 Signs Your Fridge Compressor Is Failing

The Appliance EMT video highlights three common warning signs:

1. Loud or unusual sounds
2. A compressor running extremely hot
3. A refrigerator that is no longer cooling properly

Customers may notice warmer drinks, food spoiling faster, or frozen items beginning to soften even though the refrigerator is still running.

Those are important clues, but the compressor should still be professionally diagnosed before a repair decision is made.

How Can You Tell if a Refrigerator Compressor Is Bad?

The strongest indication of compressor trouble is usually a combination of related symptoms.

For example:

Poor Cooling + Unusual Compressor Noise

A new compressor-area noise becomes more concerning when the refrigerator is also losing its ability to cool.

Excessive Heat + Poor Cooling

A compressor running extremely hot while refrigerator temperatures continue to rise deserves professional attention.

Repeated Clicking + Compressor Not Starting

This can indicate a problem with the compressor or starting system. Testing is needed to determine which component is responsible.

Long Run Times + Rising Temperatures

If the refrigerator keeps running but cannot bring temperatures down, the cooling system is not performing normally.

Fans Running + Refrigerator and Freezer Warming

This tells a technician that some parts of the refrigerator are operating, but it does not prove the compressor or sealed refrigeration system is working correctly.

Sergey’s approach can be summarized simply:

One symptom raises suspicion. Several related symptoms create a diagnostic pattern. Testing confirms the cause.

Bad Refrigerator Compressor vs. Other Refrigerator Problems

Several refrigerator failures can look like compressor problems.

What You Notice	Could the Compressor Be Involved?	Other Possible Causes
Refrigerator isn’t cooling	Yes	Fan, airflow, controls or sealed-system problem
Freezer food is softening	Yes	Airflow, fan, defrost or refrigeration problem
Compressor is extremely hot	Yes	Condenser fan, restricted airflow or electrical issue
Loud buzzing	Yes	Fan, start device, vibration or electrical component
Repeated clicking	Possibly	Start device, overload protector, controls or compressor
Refrigerator runs constantly	Possibly	Door seal, airflow, condenser or cooling-system problem
Lights and fans work but refrigerator is warm	Yes	Airflow, controls, fan or refrigeration-system issue

This overlap is why Appliance EMT does not recommend replacing a compressor based on a symptom checklist alone.

The refrigerator has to be diagnosed as a complete system.

How a Technician Tests a Refrigerator Compressor

When Sergey or another trained appliance technician investigates a suspected compressor problem, the objective is to determine why the refrigerator isn’t cooling properly.

The diagnostic process can vary by refrigerator, but it generally involves several areas.

1. Check What the Compressor Is Doing

The technician determines whether the compressor is:

• Running
• Trying to start
• Starting and stopping
• Running continuously
• Not operating at all

That behavior helps determine what should be tested next.

2. Evaluate the Compressor Starting System

Before concluding that the compressor itself has failed, the technician may check the components responsible for starting and protecting it.

A defective start component can sometimes make a working compressor appear bad.

3. Check Electrical Performance

Professional electrical testing can help identify problems involving the compressor, wiring, starting components, or refrigerator controls.

This work should be performed by someone trained to work safely around appliance electrical systems.

4. Inspect Condenser Cooling and Airflow

The refrigeration system needs to release heat effectively.

Restricted airflow or a condenser fan problem can make the compressor run hotter and longer than normal.

5. Evaluate Overall Cooling-System Performance

If the compressor appears to be operating but the refrigerator still isn’t cooling, the technician has to determine whether the refrigeration system is actually moving heat correctly.

This is where professional diagnosis becomes especially important.

The goal isn’t to assume the most expensive component has failed. It’s to identify the actual source of the cooling problem before repairs begin.

Frequently Asked Questions

Final Thoughts: How to Tell if a Refrigerator Compressor Is Bad

If you’re trying to determine how to tell if a refrigerator compressor is bad, don’t rely on a single symptom.

According to Sergey, an Appliance EMT Master Technician, the most important warning signs include poor cooling, unusual compressor-area noises, excessive heat, repeated starting problems, and abnormal run times.

The combination of symptoms is what matters.

A hot compressor isn’t automatically bad. A noisy refrigerator doesn’t necessarily have compressor failure. And a refrigerator that isn’t cooling can have several possible causes.

That’s why Appliance EMT recommends diagnosing the refrigerator before deciding that the compressor needs repair.

Appliance EMT has provided professional appliance service since 2005. If your refrigerator is no longer cooling properly or you’re noticing signs of a possible compressor problem, schedule refrigerator service with Appliance EMT for an accurate diagnosis.