Freezer Not Freezing? Troubleshooting Guide and Fixes

TL;DR: Quick Answer

A freezer that is not freezing most likely has dirty condenser coils, a failed evaporator fan motor, a bad start relay, or a defrost system failure. Most replacement parts cost under $100 and can be swapped in under an hour. If your freezer has stopped freezing completely, our San Diego freezer repair team offers same-day service across the county. Call 800-929-1192 to schedule a visit.

Common Causes of a Freezer Not Freezing

1. Dirty or Clogged Condenser Coils

Condenser coils release the heat your freezer extracts from inside the cabinet. When those coils get coated in dust, pet hair, and kitchen grease, they cannot release heat efficiently. The compressor runs longer and hotter, but the freezer never quite reaches its target temperature.

This is the single most common cause of a freezer that is not freezing, and it is also the easiest to fix. If you have not cleaned your condenser coils in the last six months, start here before replacing any parts.

How to check: Pull the freezer away from the wall and locate the coils. On most models they are either on the back of the unit or underneath, accessible from the front or rear. If you can see a thick layer of dust on the fins, they need cleaning.

How to fix: Unplug the freezer, then use a coil cleaning brush and a vacuum with a brush attachment to remove the buildup. Brush gently in the direction of the fins so you do not bend them.

Cost: Free if you do it yourself. A professional coil cleaning runs about $50 to $100.

2. Failed Evaporator Fan Motor

The evaporator fan circulates cold air from the evaporator coils into the freezer compartment. If that fan motor fails, the coils get cold but no air moves through the freezer. You may notice the back wall of the freezer is cold or even frosted, but the interior stays warm.

How to check: Open the freezer door and press the door switch. You should hear the fan running. If you hear nothing, or if the fan makes a grinding or squealing sound, the motor is likely bad. You can also check for airflow from the vents inside the freezer.

How to fix: Replace the evaporator fan motor. The part is usually located behind the back panel of the freezer compartment. Remove the panel, disconnect the old motor, and install the new one.

Cost: Part runs $50 to $100. Total repair with labor is $150 to $250.

3. Faulty Start Relay

The start relay gives the compressor the extra electrical boost it needs to start up. When the relay fails, the compressor may try to start and fail, often producing a clicking sound every few minutes. The freezer will not cool at all because the compressor never gets running.

How to check: Listen near the bottom of the freezer for a clicking sound that repeats every 2 to 5 minutes. That is the compressor trying to start and failing. You can also remove the start relay and shake it. If it rattles, it is burned out.

How to fix: Replace the start relay. It is a small part that plugs onto the side of the compressor. Pull the old one off and push the new one on.

Cost: Part is $20 to $50. Total repair is $120 to $200.

4. Defrost System Failure

Every frost-free freezer has a defrost system that melts frost off the evaporator coils a few times a day. The system has three main parts: the defrost timer (or control board), the defrost heater, and the defrost thermostat. If any one of them fails, frost builds up on the evaporator coils and blocks airflow, so the freezer stops freezing.

How to check: Look at the back interior wall of the freezer. If you see frost or ice building up, you have a defrost system failure. You can manually defrost the unit by unplugging it for 24 hours with the door open. If it works fine for a few days and then fails again, you have confirmed a defrost system problem.

How to fix: You need to identify which component failed. A technician uses a multimeter to test the defrost heater, thermostat, and timer or control board for continuity. The most common failure is the defrost heater, followed by the defrost thermostat.

Cost: Parts run $30 to $100. Total repair with labor is $150 to $300.

5. Bad Temperature Control Thermostat

The temperature control thermostat monitors the internal temperature and cycles the compressor on and off to maintain it. If the thermostat is stuck or faulty, it may not signal the compressor to turn on, or it may keep it running constantly without reaching the target temperature.

How to check: Turn the thermostat from the lowest to the highest setting. You should hear a click when it reaches the cut-in point. If you hear nothing, the thermostat may be bad. You can also test it with a multimeter for continuity.

Cost: Part is $30 to $80. Total repair is $130 to $230.

6. Condenser Fan Motor Failure

The condenser fan sits near the compressor and cools the condenser coils and compressor. If that fan motor fails, the compressor overheats and shuts off on its thermal overload, so the freezer stops cooling.

How to check: Locate the condenser fan near the compressor at the bottom of the unit. If the blade is not spinning while the compressor is running, the fan motor is likely bad.

Cost: Part is $40 to $80. Total repair is $140 to $240.

7. Worn Door Seal (Gasket)

The door gasket seals the freezer compartment and keeps warm air out. Over time the rubber can crack, tear, or lose its flexibility. Warm humid air leaks in, causing frost buildup on the evaporator coils and forcing the compressor to run constantly without ever reaching temperature.

How to check: Do the dollar bill test. Close the freezer door on a dollar bill and slowly pull it out. You should feel resistance all the way around the door. If the bill slides out easily in any spot, the gasket is weak there. Also inspect the gasket visually for cracks, tears, or areas where it is compressed flat.

How to fix: Replace the door gasket. Soak the new gasket in warm water for a few minutes to make it flexible, then press it into the retainer channel around the door.

Cost: Part is $40 to $120. Total repair is $120 to $250.

8. Compressor Failure

The compressor is the heart of the refrigeration system. It pumps refrigerant through the coils. If the compressor fails, the freezer will not cool at all. You may hear a steady hum from the bottom of the unit but no cooling. A compressor that is silent, or one that runs but never cools, is likely dead.

How to check: A technician can confirm compressor failure with an electrical test. This is not a DIY diagnosis.

How to fix: Compressor replacement requires brazing the refrigerant lines and recharging the system. This must be done by a licensed technician with EPA certification.

Cost: Part is $200 to $500. Total with labor and refrigerant recharge is $400 to $800.

9. Refrigerant Leak

A refrigerant leak in the sealed system (evaporator or condenser coils) will cause the freezer to cool partially but never reach 0 degrees Fahrenheit. The compressor runs constantly but cannot extract enough heat.

How to check: Oil stains on the floor near the freezer or on the condenser coils can indicate a leak, because refrigerant oil leaks out with the refrigerant. A technician uses an electronic leak detector to pinpoint the leak.

How to fix: The leak must be located, sealed, and the system recharged with refrigerant. This requires specialized equipment and EPA certification.

Cost: $200 to $500 depending on the location of the leak.

Brand-Specific Freezer Not Freezing Issues

Samsung

Samsung bottom freezers and French door refrigerators are known for defrost system failures. The evaporator coils frost over and block airflow to both the freezer and the refrigerator compartment. If you own a Samsung, check the back wall of the freezer for frost buildup first. See our Samsung refrigerator not cooling guide for model-specific diagnostics.

LG

LG refrigerators with linear compressors have a higher than average compressor failure rate. If your LG freezer is not freezing and you hear unusual humming from the compressor area, the linear compressor may be failing. See our LG refrigerator not cooling guide for more.

Whirlpool

Whirlpool freezers commonly fail at the defrost timer and the evaporator fan motor. If you hear a clicking sound from the defrost timer (usually located behind the temperature control panel), or if the evaporator fan is silent when the door switch is pressed, those are the likely culprits.

GE

GE freezers most often fail at the start relay and the condenser fan motor. If your GE freezer is completely warm and you hear clicking from the compressor area, the start relay is the first part to check.

How to Troubleshoot a Freezer Not Freezing: Step by Step

Work through these steps in order. Each one takes only a few minutes and rules out the most common causes before you move on to more complex diagnostics.

Step 1: Check Power and Temperature Settings

Make sure the freezer is plugged in and the circuit breaker has not tripped. Then check the temperature setting. It should be at 0 degrees Fahrenheit. If someone accidentally turned the dial down, the freezer may be running but not cold enough to freeze.

Step 2: Inspect the Door Seal

Do the dollar bill test described in cause 7 above. If the seal is weak, replace the gasket. A bad seal lets in warm air that causes frost buildup and prevents the freezer from maintaining temperature.

Step 3: Clean the Condenser Coils

Unplug the freezer and clean the condenser coils as described in cause 1. This is the most common fix and the easiest one to try. If you have never cleaned your coils, this alone may solve the problem.

Step 4: Listen for the Evaporator Fan

Open the freezer door and press the door switch. You should hear the evaporator fan running. If it is silent or making noise, replace the fan motor.

Step 5: Check for Frost Buildup

Look at the back interior wall of the freezer. If you see frost or ice building up, you have a defrost system failure. Manually defrost the unit by unplugging it for 24 hours. If it works for a few days and then fails again, you need to replace the failed defrost component.

Step 6: Test the Start Relay

If the freezer is completely warm and you hear clicking from the compressor area, remove the start relay and shake it. If it rattles, replace it. This is a $20 to $50 part that takes five minutes to swap.

When to Call a Professional for Freezer Repair

Some freezer repairs are safe and straightforward for a homeowner. Cleaning coils, replacing a door gasket, or swapping a start relay are all reasonable DIY projects. But other repairs require specialized tools, electrical knowledge, or EPA certification to handle refrigerant.

Call a professional if:

• The compressor is not running and the start relay is good
• You suspect a refrigerant leak
• The defrost system has failed and you cannot identify which component is bad
• The freezer has a sealed system problem (evaporator or condenser coil leak)
• You are not comfortable working with electrical components

At 911 Appliance Repair, we have been fixing freezers in San Diego since 1991. Our technicians carry common replacement parts on their trucks, so most repairs are completed in a single visit. The $49.95 house call is free when you proceed with the repair. Schedule freezer repair online or call 800-929-1192.

Freezer Repair Costs in San Diego

Here is what you can expect to pay for the most common freezer repairs in the San Diego area:

Repair	Part Cost	Total with Labor
Start relay replacement	$20 to $50	$120 to $200
Evaporator fan motor	$50 to $100	$150 to $250
Condenser fan motor	$40 to $80	$140 to $240
Defrost heater	$30 to $80	$150 to $250
Defrost timer or control board	$40 to $100	$150 to $300
Temperature control thermostat	$30 to $80	$130 to $230
Door gasket replacement	$40 to $120	$120 to $250
Compressor replacement	$200 to $500	$400 to $800
Refrigerant leak repair and recharge	n/a	$200 to $500

For comparison, a new chest freezer costs $200 to $800, and a new upright freezer costs $400 to $1,200. Most freezer repairs cost far less than replacement.

Preventing Future Freezer Problems

A few simple habits will keep your freezer running efficiently and prevent most of the problems above:

• Clean the condenser coils every six months. This is the single most effective maintenance task. Dust buildup is the leading cause of cooling problems.
• Check the door seal annually. Run the dollar bill test around the entire door. Replace the gasket at the first sign of wear.
• Keep the freezer 70 to 80 percent full. Frozen food acts as thermal mass, helping the freezer recover quickly after the door is opened. But do not pack it so full that air cannot circulate.
• Do not put hot food in the freezer. Let it cool to room temperature first. Hot food raises the internal temperature and forces the compressor to work overtime.
• Keep the freezer away from heat sources. Direct sunlight, ovens, and water heaters force the compressor to work harder. If possible, maintain at least 2 inches of clearance on all sides for airflow.

For more appliance maintenance tips, browse our appliance repair services page or check our refrigerator not cooling guide for related troubleshooting.

Frequently Asked Questions

How to tell if a freezer is broken?

The most obvious signs are softening food, melting ice cream, and frost or condensation on the interior walls. You may also hear unusual noises like clicking, grinding, or humming from the compressor area. If the freezer is running but the interior temperature stays above 10 degrees Fahrenheit after 24 hours, something is wrong. Check the condenser coils, evaporator fan, and start relay first, as these are the most common failures.

Why is my freezer working but not cold?

If the freezer is running but not getting cold enough, the most likely causes are dirty condenser coils, a failed evaporator fan motor, a defrost system failure, or a refrigerant leak. Start by cleaning the condenser coils and checking whether the evaporator fan is running. If those are fine, look for frost buildup on the back wall, which points to a defrost system problem.

How do I reset my freezer?

The simplest reset method is to unplug the freezer for 30 to 60 seconds, then plug it back in. This resets the control board and can clear minor electronic glitches. If your freezer has a defrost timer, you can also manually advance it by turning the timer knob clockwise until you hear a click. On models with a digital control panel, there may be a dedicated reset button or a button combination listed in the owner manual.

Can a freezer stop working but the fridge still work?

It depends on your refrigerator design. On a standard single-evaporator model, if the freezer stops freezing, the refrigerator compartment will warm up within a day because it relies on cold air from the freezer. On dual-evaporator models (common in Samsung, LG, and other modern brands), the freezer and refrigerator have separate cooling systems, so the freezer can fail while the fridge stays cold. If only the freezer is warm on a dual-evaporator model, the problem is likely the freezer evaporator fan, the defrost system, or the damper.

Is it worth fixing a freezer that is not freezing?

In most cases, yes. Most freezer repairs cost between $120 and $300, while a new freezer costs $200 to $1,200. If your freezer is under 10 years old and the repair costs less than half the price of replacement, it is generally worth fixing. The main exception is a compressor failure on an older unit (over 10 years), where a $400 to $800 repair may not make sense compared to replacement.