The short answer
A freezer that is not holding temperature is usually a defrost or seal problem rather than a dead compressor, and it fails slowly enough that the food hides it. Put a thermometer in before you judge anything, and look at where the frost is forming.
What you actually see and hear
- Ice cream soft but packets still hard — An early loss. The cabinet is above where it should be but not by much.
- A thick frost sheet on the rear wall of a frost-free cabinet — The defrost system has fallen behind and airflow is being blocked.
- Frost and ice at the door opening — Warm humid air entering past a seal.
- Running constantly and never satisfying — Heat load or a loaded condenser, depending on what else you find.
- Silent with everything thawing — Power, start circuit or compressor, which is the urgent half.
Causes, most likely first on this machine
- Defrost system failure on a frost-free cabinet — First. The heater, thermostat or control fails, frost builds where the air moves, and the cabinet warms while the compressor runs constantly.
- Door seal, hinge or alignment — Second. A freezer door is heavy and its seal takes a beating from loading, and a seal that will not hold paper admits warm damp air all day.
- Condenser coil blocked with dust — Third. Heat cannot leave the cabinet, and a freezer in a warm room is already working hard.
- Overloading, or loading warm food — Fourth. A cabinet packed against its vents cannot circulate, and a big batch of unfrozen food takes a long time to pull down.
- Thermostat or control fault — Fifth. It makes the cabinet run wrongly rather than not at all.
- Compressor or sealed system — Last, and the only one that is not an owner or ordinary repair.
Check in this order, and why
- Put a thermometer in the middle of the cabinet — Judge by a reading, not by how a bag feels.
- Look at where the frost is — Rear wall frost is defrost; door-line frost is the seal.
- Test the seal with a sheet of paper all round — Five minutes, and it explains many slow losses.
- Vacuum the condenser coil and check clearance — Free, and it is a common cause in a warm room.
What an owner can safely check
- Put a thermometer in the cabinet and read it after a day — Zero degrees Fahrenheit or below is the standard.
Tools: thermometerAbout 1440 min
- Test the door seal with paper and clean the seal and frame — Clean before replacing - residue holds a seal open more often than wear does.
Tools: paper, clothAbout 20 min
- Vacuum the condenser coil and clear the space around the cabinet — Do this before spending anything.
Tools: vacuum, soft brushAbout 30 min
- Move contents off the air vents inside a frost-free cabinet — Packed against a vent is the same as a blocked duct.
About 10 min
- Empty the cabinet and defrost it fully for a day if frost is heavy — If cooling returns, the defrost system is the fault and it will recur.
Tools: cooler, towelsAbout 1440 min
- STOP HERE before removing the rear panel or testing the heater — Live terminals and a heater are behind it.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel - a capacitor can hold a charge after the power is off. A capacitor can hold a charge after the power is off, and on a frost-free cabinet the defrost heater sits directly behind the rear panel. Never use a heat gun or a naked flame to clear frost, and never chip at ice with anything metal near the evaporator.
When to call a technician
Call when a full defrost restores cooling, because that proves the defrost system is failing and the ice will return within weeks. Call immediately if the compressor never runs. Move the contents to another freezer or a cooler as soon as you suspect a real fault rather than waiting for the visit: a freezer full of food is worth more than most freezer repairs, and refreezing thawed food is not a safe option.
Nearest pages of this class
What this page does not cover
This page is written for the domestic freezer class, not for one family or model line. Where a brand- or model-specific page exists for your unit it is the more specific answer and it is linked above, so go there first if your machine is named. What is deliberately not here: fan and defrost part numbers, thermistor resistance values, refrigerant charge and basket dimensions, all of which differ by family and belong on the page for that family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
