A freezer should sit at 0°F (−18°C). If it is much colder — ice cream rock hard, heavy frost, food at the back freezer-burned — the usual causes are the temperature dial set too low, a thermostat or temperature sensor that is not shutting the compressor off, or (in a combination unit) a stuck damper sending too much cold air. Start with the setting, then confirm with a thermometer.
What the freezer should be
The standard target is 0°F (−18°C). Colder than that does not preserve food any better, and costs more to run. Our best temperature settings guide covers both compartments.
Check the setting
- Find the freezer control
It may be a dial, a slider or a digital pad, inside the fridge or freezer.
- Move it one step warmer
Resist a big jump. Change one step and wait 24 hours, because the temperature responds slowly.
- Check for a “Max” or quick-freeze mode
Quick-freeze and power-freeze modes lower the temperature and usually time out. Make sure one has not been left on.
Measure the real temperature
Put a freezer thermometer between packages in the middle of the freezer, leave it at least 8 hours, and read it without holding the door open. A reading far below 0°F that does not respond to a warmer setting points to a component fault rather than a setting.
Likely causes
| Cause | What it looks like |
|---|---|
| Dial set too low | Cold but cycles normally; responds to a new setting |
| Quick-freeze mode left on | Colder than the setting, returns to normal later |
| Faulty thermostat or temperature sensor | Compressor runs nearly nonstop; no response to the dial |
| Stuck damper (combination units) | Freezer is fine but the fridge section is too cold |
| Full of food blocking a vent | Cold spots near the vents; warm elsewhere |
A compressor that never shuts off is a sign worth following up — see refrigerator compressor won’t turn off and refrigerator running constantly.
If the fridge section is freezing food too
On a combination refrigerator-freezer, a single sensor or damper often controls both compartments. If the fridge side also freezes lettuce and drinks, go straight to our refrigerator freezing food guide, which covers the damper and the too-empty-fridge effect.
Why too cold is a problem
An over-cold freezer uses more power, builds up frost faster and dries out food. Heavy frost may also mean the door gasket is leaking warm air; check the seal as described in our door seal guide. Never put glass bottles of liquid in a freezer that is running very cold — they can burst.
When to call a technician
If a thermometer confirms the freezer is well below 0°F after you have adjusted the setting and checked for quick-freeze mode, the thermostat, sensor or control board is likely at fault. Look at the refrigerator repair cost guide before booking.
