--- title: "Why refrigerators stop cooling, in order of likelihood" description: "The order matters more than the list: airflow accounts for most of it, and the sealed system for far less than people expect." url: "https://refrigeratorrepair.center/guides/why-refrigerators-stop-cooling/" date_modified: "2026-09-24" --- Common problems # Why refrigerators stop cooling, in order of likelihood When a refrigerator stops cooling, the most likely cause is air that cannot move: a dusty or blocked condenser, or a stopped evaporator fan. Next come a frosted coil from failed defrost, doors and settings, then misreading sensors or start relays; a sealed-system leak or compressor failure is least likely. The targets are 40°F or below and 0°F. By [RefrigeratorRepair.center technical team](https://refrigeratorrepair.center/authors/technical-team/) Published September 24, 2026 ## At a glance. When a refrigerator stops cooling, the instinct is to fear the compressor. In practice the causes line up in a fairly stable order, and the expensive one sits near the bottom of it. Read the whole guide ### Most likely cause Air that cannot move A condenser starved of room air or an evaporator fan that has stopped accounts for the largest share of warm-cabinet calls. ### Target temperatures 40°F or below, freezer at 0°F These are the FDA figures, and an appliance thermometer on a middle shelf tells you which side of them you are on. ### Least likely cause The sealed system Refrigerant leaks and compressor failures are real, but they are the minority and they come with recognizable signs. ### First thing to note Is the freezer holding its cold? That one observation splits the diagnosis into two very different branches. In this guide 1. Why the order matters more than the list 2. First: the heat has nowhere to go 3. Second: cold is made but not moved 4. Third: doors, loads and settings 5. Fourth: the controls are being misled 6. Last: the sealed system 7. Questions ## Why the order matters more than the list Any list of reasons a refrigerator stops cooling will name the same dozen parts. What such lists rarely say is how often each one is actually the answer, and that ranking is what decides where to look first. Checking the cheap, common causes before the rare, costly ones saves a visit more often than not. The order below reflects what tends to turn up across every layout and every manufacturer. A built-in and a small undercounter unit fail in the same sequence, even though the parts sit in very different places: 1. Moving air 2. Frost and defrost 3. Doors and settings 4. Sensors and controls 5. The sealed system ## First: the heat has nowhere to go A refrigerator does not create cold so much as move heat out of the cabinet and dump it into the kitchen through the condenser. If the condenser cannot shed that heat, the whole cycle loses efficiency, the compressor runs longer, and the fresh-food side is usually the first place the loss shows up. Where the condenser lives depends on the type. *Where the condenser sits and where it gets its air* | Type | Condenser location | Air supply | | --- | --- | --- | | Built-in | Behind the grille above the doors | That grille is its only source of air | | Column | One condenser for each tower | Usually a grille at the top or a kick plate at the floor | | French door and side-by-side | Mostly underneath, behind the kick plate | A small fan at the back | | Undercounter | Behind the grille at its toe | Breathes entirely through that grille | ### Signs the condenser is starved of air - Gray felt of lint and pet hair across the coil fins - A rug, trash can or toe-kick trim pressed against a front grille - A condenser fan at the back that is silent while the compressor hums - A freestanding unit pushed tight to the wall with no gap behind it Source: [ENERGY STAR — Refrigerators (air behind the unit, clean coils)](https://www.energystar.gov/products/refrigerators) — A few inches behind the fridge, and clean condenser coils A close view of a stainless refrigerator's lower front grille with a thin layer of dust across its slots. ## Second: cold is made but not moved Inside, a single evaporator coil usually sits behind a panel at the back of the freezer, and a small fan pushes its cold air through ducts into both compartments. If that fan stops, or if the coil disappears under a block of frost, the freezer may stay reasonably cold while the fresh-food side climbs past the 40°F line FDA sets. ### Frost on the coil and the defrost parts behind it Frost on the coil almost always means the automatic defrost has stopped working. A thick white layer on the freezer's back panel, or ice around the fan opening, is the visible sign. The part that has stopped is one of these: - The defrost heater - The thermostat on the coil - The timer or board that schedules defrost ### Columns and built-ins with separate evaporators Columns and many built-ins have a separate evaporator for each compartment, so on those a warm side points at that side's own fan or defrost rather than at a shared duct. Source: [FDA — Power Outages: Key Tips for Consumers About Food Safety](https://www.fda.gov/food/food-safety-during-emergencies/power-outages-key-tips-consumers-about-food-safety) — Refrigerators should be kept at 40°F or below; [FDA — Food and Water Safety During Power Outages and Floods](https://www.fda.gov/food/buy-store-serve-safe-food/food-and-water-safety-during-power-outages-and-floods) — Refrigerator at or below 40°F, freezer at or below 0°F ## Third: doors, loads and settings ### Doors that do not quite close A door that does not quite close lets humid room air in all day. Each type has its own way of getting there: - French door: the hinged flap on the left door has to fold behind the right door, and when it sticks upright both doors rest slightly ajar. - Side-by-side: a heavy dispenser door can sag until its top corner no longer meets the gasket. - Panel-ready built-in: each hinge carries a cabinet front, and that weight slowly pulls the doors out of line. ### Settings and overloading Settings deserve a look too, because they change more often than people think. A control nudged during cleaning, a vacation or energy-saving mode, or a showroom mode left on after delivery can all leave the lights working and the cabinet warm. Overloading counts as well: a shelf packed tight against the rear vents blocks the air that the fan is trying to deliver. Source: [Viking — FBI7360W built-in refrigeration manual (showroom mode, alarm codes)](https://vikingrange.com/file/1174/Viking_FBI7360W_Refrigeration_Manual_1.pdf) — Showroom mode stops temperature control; alarm codes shown on display ## Fourth: the controls are being misled ### Thermistors that read too cold Modern refrigerators decide when to run from thermistors, small sensors clipped inside each compartment and on the evaporator. A sensor that reads colder than reality tells the control board that no cooling is needed, and the cabinet warms while everything sounds normal. Many electronic controls also show numbered codes that the manual explains, which is why a technician reads the board before replacing parts. ### The compressor's start components The start components on the compressor belong in this group as well. A compressor that clicks on, runs for a few seconds and clicks off again is often being let down by its start relay or overload rather than failing itself, and that is a far smaller repair than the sound suggests. Source: [Viking — FBI7360W built-in refrigeration manual (showroom mode, alarm codes)](https://vikingrange.com/file/1174/Viking_FBI7360W_Refrigeration_Manual_1.pdf) — Showroom mode stops temperature control; alarm codes shown on display; [GE Appliances — side-by-side refrigerator owner's manual 49-60198](https://www.geappliances.com/content/older-pdfs/49-60198.PDF) — Compressor may click while trying to restart ## Last: the sealed system The compressor, condenser, evaporator and the tubing between them form a closed loop of refrigerant. When that loop leaks or the compressor fails, the symptoms tend to be distinctive: - The whole appliance warms slowly. - Frost forms on only part of the evaporator or not at all. - The compressor either runs without end or will not run at all even though it has power. ### What the repair means on each type Sealed-system work is the most expensive repair category on any refrigerator, and it needs brazing equipment and refrigerant handling that only a technician should carry out. On a column pair it involves one tower only, which is part of why owners of that layout tend to repair rather than replace. On an older freestanding unit it is often the point at which replacement becomes the sensible conversation. ## Where to stop Stop if you would need to open the sealed system, cut or bend refrigerant tubing, or reach into the machine compartment while the unit is plugged in. Lifting a built-in or column out of its opening is also a job for two trained people, because the cabinetry, the anti-tip bracket and the water line all come with it. Written by [RefrigeratorRepair.center technical team](https://refrigeratorrepair.center/authors/technical-team/). The technicians who take the calls this site books. Every guide is written from what we see on those visits and checked against the manufacturer's documentation where it exists. Sources: [FDA — Power Outages: Key Tips for Consumers About Food Safety](https://www.fda.gov/food/food-safety-during-emergencies/power-outages-key-tips-consumers-about-food-safety) · [FDA — Food and Water Safety During Power Outages and Floods](https://www.fda.gov/food/buy-store-serve-safe-food/food-and-water-safety-during-power-outages-and-floods) · [ENERGY STAR — Refrigerators (air behind the unit, clean coils)](https://www.energystar.gov/products/refrigerators) · [Viking — FBI7360W built-in refrigeration manual (showroom mode, alarm codes)](https://vikingrange.com/file/1174/Viking_FBI7360W_Refrigeration_Manual_1.pdf) · [GE Appliances — side-by-side refrigerator owner's manual 49-60198](https://www.geappliances.com/content/older-pdfs/49-60198.PDF) For the heart of your home. ## Questions owners ask. ### How long should I wait after cleaning the grille before judging whether it worked? Give it about 24 hours with the doors kept closed. A cabinet that has been warm for days takes that long to pull down, and a reading taken after an hour will look like nothing changed. ### The compressor is running but nothing is cold. Is that the sealed system? Not necessarily. A running compressor with a silent evaporator fan or a frosted coil produces the same warm cabinet. A technician checks airflow and frost before concluding anything about refrigerant. ### Why did it stop cooling right after a heat wave? A condenser that was only just coping in a mild room can fall behind when the kitchen reaches the high 80s. The heat exposes a dirty coil or a weak condenser fan rather than causing a new problem. ### Does a warm refrigerator mean the food has to go? It depends on how warm and for how long. The FDA says to discard perishables that have been above 40°F for 2 hours or more, and our food safety guide walks through the decision. ## The problems behind it. Each has a page of its own: what it usually means and the causes in the order worth checking. [All 18 problems](https://refrigeratorrepair.center/problems/) Food safety applies ### Refrigerator Not Cooling 7 causes, cheapest first Food safety applies ### Fresh Food Section Warm, Freezer Cold 5 causes, cheapest first Problem ### Frost Building Up in the Refrigerator 4 causes, cheapest first Food safety applies ### Freezer Not Freezing 6 causes, cheapest first ## When it needs a technician. 38 error codes on this site send owners here first. The repairs on the right are where this guide ends when the checks do not settle it. [Samsung 21E](https://refrigeratorrepair.center/error-codes/samsung-21e/) [Samsung 22E](https://refrigeratorrepair.center/error-codes/samsung-22e/) [LG dH](https://refrigeratorrepair.center/error-codes/lg-dh/) [LG ER IF](https://refrigeratorrepair.center/error-codes/lg-er-if/) [LG ER FF](https://refrigeratorrepair.center/error-codes/lg-er-ff/) [LG ER rF](https://refrigeratorrepair.center/error-codes/lg-er-rf/) [GE dE](https://refrigeratorrepair.center/error-codes/ge-de/) [Frigidaire SY EF](https://refrigeratorrepair.center/error-codes/frigidaire-sy-ef/) [Sub-Zero 20 2 00](https://refrigeratorrepair.center/error-codes/sub-zero-20-2-00/) [Sub-Zero 35 R 33](https://refrigeratorrepair.center/error-codes/sub-zero-35-r-33/) ### Diagnostic visit The visit that decides what the repair actually is, before any part is ordered. ### Fan and airflow repair Two fans, two completely different failures — one stops the cold arriving, the other stops the heat leaving. ### Maintenance The one visit that prevents more calls than any other, and the cheapest thing on this list. ### Sealed system and compressor The expensive end of the list, and the one where the type of refrigerator decides whether to do it at all. ## More in common problems. What a refrigerator is actually telling you when it drifts warm, frosts up, runs without stopping or goes quiet. [The whole section](https://refrigeratorrepair.center/guides/common-problems/) Why it is doing that ### Fridge warm, freezer cold — the most diagnostic pattern there is The appliance is still making cold and has stopped delivering it, which rules out the expensive answer almost entirely. Why it is doing that ### A refrigerator that never stops running The food can still be perfectly cold while this is happening, which is why it gets ignored until it becomes a cooling call. Guides ### All 19 guides Six sections, by what you are trying to find out. --- **[Read on the site: Why refrigerators stop cooling, in order of likelihood](https://refrigeratorrepair.center/guides/why-refrigerators-stop-cooling/)** **[Book a visit with RefrigeratorRepair.center](https://refrigeratorrepair.center/schedule/)**