The short answer
On a Home refrigerator, a cabinet that runs continuously without getting cold is usually an airflow or heat-rejection problem rather than a dead compressor. The first thing to check: airflow blocked by a frosted evaporator. Most of the causes below are owner-checkable in minutes; only the last one is a service call.
What you observe
- The cabinet is warm but the unit is clearly running — The compressor hum is there and the air inside is not cold.
- The freezer is holding but the fresh-food side is not — A split like this is about air moving between the two, not about cooling being absent.
- NEAR MISS — the cabinet is silent and nothing is cold — That is a no-power or start-device fault and it belongs on a different page. If nothing hums at all, leave this one.
Causes, most likely first on a Home refrigerator
- Airflow blocked by a frosted evaporator — The defrost cycle stops clearing the coil behind the freezer rear panel. Ice builds into a sheet, the fan can no longer push air through it, and the fresh-food side warms while the compressor runs on. On a retail-label build this ranks behind the consumables: those go first, and they go often.
- Door not sealing, or held open by a shelf or an overfilled bin — A seal that leaks lets warm humid air in continuously. The cabinet never reaches temperature, ice collects where it should not, and the compressor never gets to stop. The door hardware is the cheapest assembly on a retail-label build, and it is the one the owner operates thousands of times.
- Condenser coil blanketed in dust, or no room to reject heat — The coil gives up the heat the cabinet takes out. Covered in dust, or pressed against a wall in a warm room, it cannot, so the compressor runs without ever pulling the box down. On a retail-label build this ranks behind the consumables: those go first, and they go often.
Check in this order, and why
- Look behind the freezer rear panel for a sheet of frost — It separates an airflow fault from a heat-rejection one before any tool comes out. It is first because it is the highest-ranked cause here.
- Close the door on a sheet of paper and pull it out at several points — A gasket that releases the paper easily anywhere around the frame is leaking there. Second: the next most likely, and free to rule out.
- Feel the coil and the surrounding air at the back or underneath — A coil that is warm but smothered, or an alcove with no air moving through it, explains the symptom on its own. Third, and only once the two above are clean.
What an owner can safely check
- Empty both compartments, switch the cabinet off and leave the doors open until the ice is gone — Cold that returns afterwards and then fades again over days confirms the defrost system rather than the compressor.
Tools: towelsAbout 45 min
- Put a thermometer in a glass of water in the middle of the cabinet — A refrigerator holds food safely at 40 degrees Fahrenheit or below, so measure before you judge it.
Tools: thermometerAbout 20 min
- STOP HERE if the next step needs a meter on live terminals — That is where the owner checks end and a service call begins.
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. Never defeat a door switch to keep a fan running while you work, and leave refrigerant work to a licensed technician: the sealed system is not an owner repair and opening it is both illegal and unsafe without the right equipment.
When to call a technician
Call once the airflow, the coil and the door checks are all clean and the cabinet still will not hold temperature. Call immediately if you see oil around the compressor, smell burning, or hear the compressor try to start and stop repeatedly: oil outside the tubing means the sealed system is open, and every hour the unit runs after that makes the repair larger. A cabinet that will not hold food at 40 degrees Fahrenheit or below is a same-week job, not a someday job.
Nearest pages of this class
What this page does not cover
This page covers Home refrigerators as a class, not one family or model line. Where a family- or model-specific page exists for your unit, that page is the more specific answer and the one to read first. Deliberately not here: wiring colours, torque figures, part numbers and service-manual sequences, which differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
