Troubleshooting
Freezer not freezing: what to check and what it usually is
A freezer that is running but not freezing is usually telling you one of three things: it cannot get rid of heat, it cannot move cold air, or it has frozen itself up. Here is how to tell which, what you can safely do, and when to stop and call.
First, protect the food
Keep the door closed as much as possible. A full freezer holds its temperature much longer than an empty one. If it is warming fast, move what you can to another freezer or a cooler with ice. Put a thermometer inside so you know where you stand rather than guessing; anything that has thawed and sat warm should be judged by food-safety guidance, not by how it looks.
The process
What you can safely check first
- Check the setting and the thermometer
Make sure the control was not bumped to a warmer setting. Aim for about 0°F, measured with an appliance thermometer, not the dial.
- Check the door seal
Close the door on a sheet of paper in several places. If it slides out with no drag, the gasket is not sealing there. Make sure nothing in the freezer is holding the door or lid slightly open, and that a chest freezer lid closes flat.
- Listen and feel for airflow
On a refrigerator freezer or frost-free upright, you should hear a fan inside the freezer when the compressor runs and feel air at the vents. Make sure food is not packed against the vents. If there is no fan sound at all, note it.
- Unplug, then clean the condenser coils
Unplug the unit first. Remove only the front kick plate and vacuum the coils with a soft brush; do not remove other panels. On garage freezers, also clear dust and cobwebs around the back and the compressor area so air can move.
- Give it room to breathe
Freezers need clearance around them to shed heat. Pull it away from the wall if it is jammed tight, and keep boxes off the sides and top of a chest freezer.
- Think about the room
Many freezers are not built for a hot garage in summer or an unheated one in winter. If yours is in a garage, check the manual for its temperature range; an out-of-range room causes freezing problems without anything being broken.
The usual causes, most common first
Dirty condenser coils or a stopped condenser fan. The freezer cannot dump heat, so the compressor runs constantly and the cabinet still warms up. You often hear it running nonstop, and the area near the compressor feels hot. On refrigerators, the condenser fan sits next to the compressor at the bottom back; if it does not spin when the compressor runs, it has failed.
Defrost system failure. Frost-free freezers melt their own frost every few hours using a defrost heater, a defrost thermostat and a timer or control board. When any of those fails, frost builds up on the evaporator coil behind the back panel until air cannot get through. The tell-tale signs: thick frost on the back wall of the freezer or around the vent, a freezer that slowly gets warmer over days or weeks, and on a fridge, the fresh-food side going warm first. Unplugging it for a day melts the ice and it works for a while, then the same thing happens. Manual-defrost uprights and chest freezers do not have this system and simply need defrosting when the frost gets thick.
Evaporator fan motor. The fan that pushes cold air across the evaporator and into the freezer. When it stops, the coil gets cold but the cabinet does not. Often it gets noisy first, a chirp or a grind that changes when you open the door.
Worn door gasket. A torn, flattened or twisted gasket lets humid air in. Expect frost on the food and around the door opening, and a compressor that hardly ever stops.
Start relay or compressor problems. If you hear a click every few minutes from the back, but the compressor does not keep running, the start relay or the compressor itself is the suspect. That needs testing with the right equipment.
Thermistor or control board. The temperature sensor tells the control when to run. If it reads wrong, the freezer simply does not run long enough.
Sealed system problems. A refrigerant leak or a restriction. The compressor runs, the condenser fan runs, the coils are clean and frost-free, and it still does not get cold. Sealed system work is for licensed technicians only; never cut, puncture or open any refrigerant tubing.
When to call a technician
Call us when:
- The back wall or vent of the freezer is covered in frost, or the freezer works for a while after being unplugged and then fails again.
- You cannot hear the freezer fan, or it grinds or squeals.
- The compressor clicks on and off without running, or runs nonstop with clean coils.
- The gasket is torn or will not seal.
- Clean coils, a good seal and normal airflow still give you a warm freezer.
If you smell burning, see smoke, or the cord or outlet is hot or scorched, unplug it if you can do so safely and leave it off.
On a freezer or refrigerator still under a manufacturer or extended warranty, do not remove panels yourself. File with the plan first; our warranty appliance repair page explains how warranty dispatches work with us.
Our technicians bring over 15 years of repair experience to freezer repair and refrigerator repair, including chest freezers and garage uprights. Request an appointment and tell us what you are seeing. We serve homes in Locust Grove, Orange and nearby communities.
Questions
Freezer questions
Why is my freezer running but not freezing?
The most common causes are dirty condenser coils, a failed condenser or evaporator fan, and a defrost failure that has iced over the evaporator coil. Less often it is a start relay, a sensor, or a sealed system problem.
Why is there so much frost in my freezer?
In a frost-free freezer, heavy frost on the back wall usually means the defrost system has failed: the defrost heater, the defrost thermostat, or the timer or control. Frost on food and around the door is more often a door seal or a door left ajar.
My freezer works after I unplug it for a day. Is it fixed?
No. Unplugging it melted the ice off the evaporator coil, which is why it works again. If the defrost system has failed, the frost will build up again and the freezer will warm up again. That needs a repair.
Can a freezer in the garage stop working in winter?
Yes. Many freezers and refrigerators are not rated for a cold garage. When the room is colder than the control expects, the unit may not run enough to keep the freezer at temperature. Check the manual for the rated room range.
Is it worth repairing an old freezer?
Fans, defrost parts, relays and gaskets are usually worth repairing. A sealed system failure on an older unit often is not, and we tell you that plainly after the diagnosis.
Freezer still warm?
Tell us what kind of freezer it is, what you are seeing, and the model number. We confirm a day and arrival window with you before anything is locked in.