Refrigerator Not Cooling? What Each Symptom Points To
Which compartment is warm, whether the compressor and fans are running, and what the frost on the back wall looks like will narrow the cause before anyone opens a panel.
By Daniil, owner and lead technician · Updated · Rated on Google from 109 reviews
Check these first
- Measure, don’t guess. Put a thermometer in a glass of water in the middle of the shelf for a few hours. The FDA guideline is 40°F or below in the refrigerator and 0°F in the freezer.
- Setting and power. Check the control wasn’t bumped, and that the unit isn’t in a showroom, demo or Sabbath mode (lights on, little or no cooling).
- Doors. Look for a torn or flattened gasket and anything stopping the door from closing. A door left slightly open overnight can ice the coil and leave the unit warm for a day.
- Airflow inside. The vents between the freezer and the fresh-food section are easy to block with a bag or a container. Clear them.
- Condenser. Coils packed with dust make a refrigerator run constantly and cool poorly; on top-mount built-ins this is common. Clean them with the unit switched off.
- Listen. Is anything running? A compressor hum, the condenser fan near the bottom or top, and a fan behind the freezer panel. Silence, or a click every few minutes, is useful information.
What the pattern points to
| What you see | What we check first |
|---|---|
| Fresh-food section warm, freezer still cold | Evaporator fan, defrost failure (iced coil), air damper |
| Both sections warm | Condenser fan, dirty condenser, compressor start relay or inverter board, sealed system |
| Frost or ice building on the freezer’s back panel; temperatures drift up and down | Defrost system: heater, sensor or control. Ice blocks the air path, so the fan runs but moves little cold air |
| Water under the crisper drawers or on the floor | Frozen or clogged defrost drain, water inlet valve, supply line |
| Loud buzzing, grinding or clicking | Fan blade striking ice, worn fan motor, compressor trying to start |
| Runs constantly | Condenser coils packed with dust (common on top-mount built-ins), torn door gasket, failing defrost |
| Compressor runs, coil stays warm or only partly frosts | Possible sealed-system fault: refrigerant leak, restriction or a weak compressor |
Why a freezer can be cold while the fridge is warm
In most frost-free refrigerators one cold coil, the evaporator, sits behind the freezer’s back panel. A fan pulls air across it and pushes some of that air through a duct or damper into the fresh-food section. If the fan stops, the damper sticks, or the coil turns into a block of ice because the defrost system failed, the freezer stays reasonably cold (it is right next to the coil) while the fresh-food side warms up. That is why this pattern is usually a fan, defrost or airflow fault and not the compressor.
In San Francisco flats with kitchens against uninsulated exterior walls, we see evaporator icing more often than average, so a warm fresh-food section with a cold freezer there is usually a defrost, evaporator-fan or airflow fault.
Don’t defrost it before the technician comes
If you can manage, call before unplugging or defrosting. The frost and ice on the evaporator are evidence: an even light frost, a solid block of ice, or a coil with no frost at all each point to a different fault, and defrosting erases the pattern. Take photos of any frost, ice, water or error codes. If you have to defrost to save food, tell the technician.
Food safety while you wait
Keep the doors closed. Per USDA guidance, a closed refrigerator keeps food safe for about 4 hours without cooling, and a full, closed freezer about 48 hours. Move perishables to a cooler with ice if it has been longer, or if your thermometer reads above 40°F.
What we check on a no-cool call
We check whether the compressor and condenser fan are running, feel for airflow from the evaporator fan, look at the evaporator coil for a frost pattern that points to a defrost failure, and read the control’s fault history on models that store one. Those checks narrow the fault considerably, but a symptom alone does not identify the failed part; some faults need further testing or a second visit before we can say what failed. The job on the first visit is to prove which part failed, not to swap parts until the symptom goes away.
Fans, relays, sensors, water valves and defrost parts are common enough that the part is sometimes on the truck. Built-in parts and sealed-system work usually mean a second visit; you get the lead time before you approve.
Repair or replace?
There is no rule by part. Whether a repair makes sense depends on what the diagnosis finds, the refrigerator’s age and overall condition, whether parts are still available, and the total cost compared with replacement. A fan, relay, sensor, valve or defrost repair is often reasonable; a control board or sealed-system repair on an older freestanding unit may not be. We give you the total before you decide.
Built-in refrigerators are a different calculation: they are designed for long service lives and sit in a custom cabinet opening, so repair is often worth pricing before replacement is considered. One customer’s 27-year-old built-in was diagnosed the next morning and running again by the following Tuesday.
Brand-specific guides
- Sub-Zero not cooling: dual refrigeration systems, Sub-Zero’s temperature thresholds and service indicators.
- GE refrigerator error codes.
- Repair records: Sub-Zero defrost repair in Sausalito.
Refrigerator repair in Marin County and San Francisco
UniFix repairs freestanding, built-in and integrated refrigerators and freezers across Marin County from San Rafael, Novato, Mill Valley, Sausalito, San Anselmo, Corte Madera and Larkspur to Tiburon, and in San Francisco from our Marina location. Diagnostic visits start at $85; the fee varies by appliance type, brand, location and appointment requirements, is confirmed before scheduling, and is applied toward the repair if you go ahead. Repairs carry a written warranty on parts and labor; the term is stated on your invoice. More on our refrigerator repair page.
Call Marin (415) 494-7882 or San Francisco (415) 683-0403. Tell us the brand and model, which section is warm and since when, and what you hear.
Common questions
Why is my freezer cold but my refrigerator warm?
Should I defrost the refrigerator before the appointment?
How long is food safe in a refrigerator that stopped cooling?
My refrigerator runs all the time but is still warm. What is wrong?
Is a sealed-system repair worth it?
Sources
Request a visit
Prefer to talk? Call (415) 494-7882 (San Francisco: (415) 683-0403). UniFix Appliance Repair diagnostic visits start at $85. The diagnostic fee varies by appliance type, brand, location, and appointment requirements. We confirm the fee before scheduling. If you approve the repair, the diagnostic fee is applied toward it.