Three states, three different problems
| What you hear and feel | Where to look |
|---|---|
| Compressor hums steadily, cabinet not cold enough | dirty condenser, blocked vents, door seal, evaporator fan (automatic-defrost), low refrigerant |
| A click every few minutes, then quiet | start relay or overload on the compressor, or the compressor itself |
| Completely silent, light may still work | thermostat or control, wiring, compressor that will not start |
A freezer not cold enough but humming along is the first row; a chest freezer not cold and silent is the third. The compressor is the small tank-shaped unit at the bottom back of an upright, or in a compartment at one end of a chest freezer. Put your hand near it: running compressors are warm and hum.
Checks that cost nothing
- Setting. Someone may have turned the dial. Most freezers reach 0°F on a middle setting.
- Door or lid. Close it on a dollar bill in several spots; if the bill slides out easily, the gasket is not sealing. Overfilled chests often hold the lid slightly open.
- Breathing room. Clear boxes and bags away from the back and sides. An upright with coils at the back needs a few inches of space; a chest with condenser tubing in its walls needs clear space along its sides.
- Condenser coils. On models with exposed coils, unplug and vacuum them. Dust on the coils makes the compressor run long and still fall short.
- Room temperature. Check the manual's room temperature range. A freezer in a very hot or unheated garage can fall outside it.
Automatic-defrost uprights: the fan and the frost
On an automatic-defrost upright, cold is made behind the back panel and blown into the cabinet by an evaporator fan. If the fan stops, the coil gets cold but the air around the food does not. If the defrost system fails, frost chokes the coil and the fan cannot move air through it. A thick layer of frost on the back panel, or a fan you cannot hear when the door switch is pressed, points there. The freezer frost buildup page covers that failure in detail.
What these repairs cost
| Repair | Parts and labor |
|---|---|
| Thermostat | $75–$300 |
| Start relay | $75–$300 |
| Fan | $100–$300 |
| Door or lid seal | $150–$500 |
| Regassing (after a leak repair) | $200–$500 |
| Compressor | $250–$650 |
Fixr national freezer guide, updated August 29, 2025. Its range for a freezer that is "not cold enough" runs from $50 to $500, which reflects how different a coil cleaning is from a compressor.
Sealed-system faults and the age question
If the compressor runs constantly, the condenser is clean, the fan works and the cabinet still will not get cold, the refrigerant circuit is the remaining suspect: a leak, a restriction or a compressor that no longer pumps. Opening that circuit calls for EPA Section 608 certification unless the refrigerant is an exempted one such as isobutane, and the work sits at the top of the price range. Fixr's advice is to repair a freezer under ten years old if the bill is under half the price of a new one; replacement there runs $600 to $1,150.
Before the technician arrives
Keep the door closed, move the most valuable food if you can, and write down the temperature reading with the time. Say whether it is a chest or upright, how old it is and what you hear. The model number is on a label inside the lid or on an inner side wall.
Questions people ask next
What temperature should a freezer hold?
0°F or colder. That is the food-safety target the FDA gives for freezers, and most freezers are set to reach it on the middle setting. Measure with a thermometer between packages, not in the door.
The freezer clicks every few minutes and never really runs. What is that?
That is the compressor trying to start and its overload cutting it off. The start relay, the overload or the compressor itself is at fault, and a technician can tell which with a meter. Unplug it between attempts if food is not at risk, because repeated tries heat the compressor.
Can a freezer be recharged with refrigerant?
Only after the leak is found and repaired, and, for most refrigerants, only by a technician with EPA Section 608 certification; isobutane (R-600a) is one of the exempted ones. Adding refrigerant to a leaking system just delays the next failure. On an older freezer, a leak in the sealed system is often the point where replacement makes more sense.
Sources
- How much does it cost to repair a freezer?, Fixr, updated August 29, 2025.
- Food and Water Safety During Power Outages and Floods, U.S. Food and Drug Administration, read September 29, 2026.
- Freezing and Food Safety, USDA Food Safety and Inspection Service, last updated August 9, 2024.
- Section 608 Technician Certification, U.S. Environmental Protection Agency, read September 29, 2026.
- 40 CFR 82.161, Technician certification, eCFR, read September 29, 2026.
- Stationary refrigeration: prohibition on venting refrigerants, U.S. Environmental Protection Agency, read September 29, 2026.
Reviewed October 1, 2026. Spotted an error? Write to admin@compareappliancerepair.com.