You open the door and the light snaps on like always. But the milk’s warm and the freezer bags feel soft, and you’re standing there wondering why your fridge and freezer are not cooling but the light is on. Most guides say a working light means a working outlet, so the compressor must be dead. That skips the free settings and the ten dollar part behind a big share of these calls.
This guide runs the diagnosis in order: demo mode, then airflow, then defrost, then the sealed system. You’ll know tonight what to check and where to stop.
Fridge and Freezer Not Cooling but Light Is On
Fridge and freezer not cooling but light is on almost always traces to demo mode, a blocked fan, or a failed start relay, not a dead compressor, since the light runs on a circuit separate from cooling. Check the cheap causes first, before a repair call costs money you don’t need to spend.Start Here, Save Your Food Before You Fix Anything
Move perishables into a cooler with ice within ten minutes. The safe holding clock on a warm fridge is shorter than most assume.
Your four hour clock started when the air went warm
A closed refrigerator holds safe cold about four hours once cooling stops, starting when the compressor quit, not when you noticed.
The federal food safety chart for refrigerated and frozen food puts a full freezer near 48 hours, half full near 24.
Pack the cooler now, then come back and read
Grab a cooler and ice before reading further. A family running a twelve year old Frigidaire, now owned by Electrolux Group, lost 340 dollars of food testing relays before moving anything to a cooler.
- Move meat, dairy, and eggs into the cooler first.
- Group frozen items tight so they hold each other cold.
- Keep both doors shut between troubleshooting steps.
What you can refreeze and what goes in the bin
Food still holding ice crystals or reading 40 degrees or below is safe to refreeze. Anything above that for more than two hours goes in the trash.
| Item type | Safe threshold | Refreeze or discard |
|---|---|---|
| Meat, poultry, seafood | Ice crystals or 40°F or below | Refreeze |
| Dairy and eggs | Above 40°F over 2 hours | Discard |
| Leftovers, cooked food | Above 40°F over 2 hours | Discard |
| Frozen vegetables | Still frozen solid | Refreeze |
Never taste or smell food to test it; that won’t catch dangerous bacteria. Once a spoiled freezer runs again, clearing lingering spoiled food odors from a freezer is its own project.
What That Light Actually Tells You and What It Doesn’t
The light and cooling system run on separate circuits, so a working light confirms only that the outlet has power, nothing about the compressor, fans, or defrost.
Fridge and freezer not cooling but light is on?
It means the breaker held and the low voltage board is alive, but the cooling circuit failed downstream.
Why a working display sends people to the wrong repair
A lit, responsive panel convinces most owners the unit is fine, but it runs off the same board as the light. One technician with over a decade of service calls puts it simply: check the cheap stuff first, since most “broken” fridges just got bumped into demo mode or lost a relay.
One compartment warm versus both warm changes everything
Both compartments warm points to the compressor, relay, board, or demo mode. A warm fridge next to a cold freezer points to airflow or a damper.
| Symptom pattern | Likely cause | Look first |
|---|---|---|
| Both compartments warm | Compressor, relay, board, or demo mode | Back panel |
| Fridge warm, freezer cold | Blocked damper or evaporator fan | Freezer panel vent |
| Freezer warm, fridge cold | Defrost system failure | Evaporator coil |
A damper stuck open causes the reverse problem. Why food keeps freezing in the refrigerator often traces to that same damper family, and a warm freezer paired with a cold fridge covers this exact split.
Rule Out Demo Mode Before You Call Anyone
Demo mode (a retail setting disabling the compressor while lights and the panel stay active) explains a surprising share of “dead” fridges, also called Cooling Off or Showroom mode.
The showroom setting that fakes a working fridge
Stores use this setting to show off lighting without running the compressor. A fridge delivered on move-in day once ran warm three days after the delivery crew bumped the demo buttons during a tight doorway squeeze.
Whirlpool Corporation, which also owns KitchenAid, Maytag, and Amana, documents this across all five brands.
OF F, “Cooling Off”, and other quiet warnings
LG Electronics shows “OF F” on the panel in demo mode. Samsung Electronics calls it demo, exhibition, cooling off, or showroom mode. Samsung’s Cooling Off mode display codes include OF OF, O FF, OFF OFF, or a scrolling bar, and many owner’s manuals never mention this mode at all.
How to check it on the four big brands
Every brand uses a different button combination to exit demo mode.
| Brand | Combination | Confirms it worked |
|---|---|---|
| Samsung | Hold Power Freeze and Power Cool | Fan noise returns in minutes |
| LG | Hold the two panel-listed buttons | “OF F” clears from screen |
| Whirlpool, KitchenAid, Maytag, JennAir | Hold documented pair, door open | Compressor hums within 5 minutes |
| GE Appliances | Unplug two full minutes | Mode often resets on power up |
GE Appliances, manufactured under license by Haier Smart Home since its 2016 acquisition of GE’s appliance division, often clears demo mode with that unplug. When the fan doesn’t return, a GE freezer that stops freezing properly covers brand-specific checks.
Listen at the Back, Is the Compressor Even Trying?
Pull the fridge out, put a hand near the compressor housing, and listen. What you feel next narrows it to a relay, an overload trip, or a dead compressor.
Put your hand near the black canister down low
Warm and silent usually means it tried, overheated, and shut itself off. Cold and silent after hours means no start signal ever arrived.
Click, pause, click again is the relay talking
A repeated click every few seconds is the start relay (the small device that kicks the compressor motor over at cycle start) trying and failing to catch. One forum owner traced that clicking to a fifteen dollar failed relay after weeks of assuming the compressor was gone.
The condenser fan is running but nothing gets cold
A spinning fan with a hot, silent compressor usually means the overload protector tripped from heat, not a dead compressor.
A four year old side by side wedged behind a family’s dog bed had exactly this: coils clogged with pet hair, compressor too hot to run.
Pull the Grille and Look at Your Coils
Dirty condenser coils are among the cheapest, most common causes of a fridge that won’t cool, and fifteen minutes with a vacuum fixes most of them.
Fifteen minutes with a vacuum and a coil brush
Unplug first, then pull the base grille or slide the fridge forward. Vacuum gently along the fins, not against them.
How often this actually needs doing in a real kitchen
Clean condenser coils every six to twelve months, per the U.S. Department of Energy’s Building America guidance. Pets, carpet, or a busy kitchen push you toward six months.
The one inch of wall clearance everyone ignores
Samsung specifies at least one inch of clearance behind the fridge. Heat that can’t escape turns into extra compressor runtime, the same way sunlight or a nearby oven would.
Open the Freezer Panel, Frost Tells the Story
Frost on the evaporator coil shows whether the sealed system is still running or the defrost cycle stopped clearing it.
Frost on the back wall versus no frost at all
Even, light frost means refrigerant is still moving through the sealed system (the closed loop of compressor, coils, and refrigerant lines that produces cold). A solid ice block means defrost quit.
No frost with a warm cabinet points to the compressor or a leak.
| Frost pattern | Likely failed part | DIY or call |
|---|---|---|
| Light, even frost | Sealed system working, look elsewhere | DIY |
| Solid ice block | Defrost heater, thermostat, or timer | Often DIY |
| No frost, cabinet warm | Compressor or refrigerant leak | Call a tech |
The 24 hour defrost test forum threads swear by
Empty the freezer, unplug, and leave both doors open a full 24 hours to melt built-up ice before judging whether cooling returns. One reader’s fridge came back fully, only for ice to return three weeks later, confirming the defrost system was the real problem.
Defrost heater, thermostat, or the board deciding badly
Automatic defrost runs on a timer or adaptive defrost control board (the circuit deciding when to defrost based on compressor runtime), a heater, and a thermostat. Any one failing buries the coil in ice within weeks.
The kenmore freezer troubleshooting guide covers model-specific timer locations for Whirlpool-built units.
Check the Fans, the Damper, and the Seals
A dead evaporator fan, a stuck damper, or a leaking gasket can each mimic a compressor failure that isn’t really there.
Press the door switch and listen for the fan
The evaporator fan pushes cold air from freezer to fridge, cutting off the moment a door opens. Hold the switch in and listen for a whir, not silence.
The damper that starves your fridge while freezer stays cold
Bottom freezer and side by side models feed the fridge through one air damper (the flap controlling cold airflow from freezer to fridge), and one stuck closed leaves the fridge warm while the freezer stays solid.
A renter chased a twenty dollar bimetal damper part for three weeks after replacing a working thermostat first. A Kenmore refrigerator not cooling as it should walks through this same damper design.
Dollar bill test on the gasket, twice around
Close the door on a dollar bill at a few points and tug gently. An easy slide means warm air is leaking in and feeding the frost problem. Gasket replacement runs a few hundred dollars installed, or far less DIY.
The Cheap Parts Worth Swapping Yourself Tonight
A failed start relay, a bad thermistor, or a worn door switch each cost under thirty dollars and can explain a fridge that looks dead.
The start relay that costs less than takeout
Unplug the fridge, pull the relay off the compressor, and shake it, listening for a loose rattle. Replacements run ten to thirty dollars, sometimes reviving a fridge written off as dead.
Compressors that click but never catch sometimes need fitting a hard start kit on a compressor instead.
Thermistors and door switches you can reach in minutes
A failed thermistor (the sensor telling the control board when to start cooling) never sends the signal, producing silence and a normal-looking display. Test its resistance against the brand’s chart first.
When a cheap swap is just borrowed time
Replacing the same part twice usually means the compressor itself is dragging on startup. One forum owner swapped the board, relay, and thermostat before buying a new fridge. Set a spending ceiling first.
When to Stop and Call a Sealed System Tech
Refrigerant work needs an EPA certified technician, not a home repair attempt.
Refrigerant work needs EPA certification, not a video tutorial
Federal law requires EPA Section 608 technician certification for anyone recovering, handling, or recharging refrigerant, work that means brazing joints, pulling a vacuum, and recharging the exact charge needed.
The symptoms that mean the sealed system, not a part
A chemical smell, oily residue near the lines, or a compressor that never cycles off all point to the sealed system, not a swappable part.
| Symptom | Sealed system likelihood | Next step |
|---|---|---|
| Chemical smell or oily residue | High | Call an EPA certified tech |
| Compressor runs constantly | High | Call an EPA certified tech |
| Clean coils, good fans, healthy relay, still warm | High | Call an EPA certified tech |
| Uneven or missing evaporator frost | Moderate to high | Call an EPA certified tech |
What a written estimate should list before you agree
A trustworthy estimate itemizes parts, labor, refrigerant, and the diagnostic fee separately, generally landing in the 700 to 1,250 dollar range once a new compressor is involved.
A tech who checks the relay and coils first, before mentioning the compressor, is worth keeping.
Repair or Replace, Run the Numbers Honestly
Repair when the numbers favor it, replace when they don’t.
Check your compressor warranty before you pay a dime
Many manufacturers cover the compressor part for five to ten years, with labor covered only the first year.
LG Electronics settled a class action over linear compressor failures covering 31 models and roughly 1.6 million refrigerators, per Consumer Reports, with payments from 50 to over 3,500 dollars plus a warranty extended to five years from purchase.
The fifty percent rule, and where age beats it
Repair when the cost sits under half a comparable new replacement, and lean toward replacing past about ten years old. Fan, defrost, and relay repairs almost always beat replacement at any age.
What a replacement really costs beyond the sticker
A new refrigerator’s price tag skips delivery, haul away, and the groceries already lost while the old one sat warm. One household repaired a seven year old unit’s control board instead of replacing it, and got six more years out of that fridge.
Keep This From Happening Again Next Summer
Two cheap thermometers, a twice yearly coil cleaning, and not overpacking the shelves catch most of these failures early.
Two thermometers cost less than one spoiled grocery run
Keep the fridge at 40°F or below and the freezer at 0°F or below, checked with a standalone thermometer rather than the built-in display alone. A slow-failing compressor drifts a degree or two for days before anyone notices without one on the shelf.
The twice a year habit that saves your compressor
Clean the condenser coils in spring and fall, on a calendar reminder set today. Check the rear clearance and wipe the gasket the same day.
Don’t overfill it, and don’t run it empty either
Load the fridge to roughly 70 percent of capacity, per Samsung’s guidance; packing past that blocks vents and creates warm pockets that mimic a real failure.
A freezer packed solid after a holiday party once stopped cooling evenly within a week, no broken part involved.
Conclusion
You walked in assuming a lit fridge meant a dead compressor and a four figure bill. You’re walking out knowing that light only confirms the outlet works, and that demo mode, a clogged coil, a stuck damper, or a fifteen dollar relay explains a surprising share of these failures instead.
Unplug the unit tonight, pull the grille, and set a thermometer on the shelf before assuming the worst. Every hour spent diagnosing in order is an hour you don’t pay someone else to guess.
Frequently Asked Questions
Why is my fridge and freezer not cooling but the light is still on?
Usually demo mode, a blocked condenser fan, or a failed start relay, not a dead compressor. The light and cooling system run on separate circuits, so a working bulb only confirms the outlet has power.
Is my food still safe if the refrigerator has been warm for a few hours?
Yes, within about four hours for a closed fridge and up to 48 hours for a full freezer. Anything above 40 degrees for over two hours should be thrown out.
Could my refrigerator just be stuck in demo mode?
Yes, this is more common than owners realize. Check the display for codes like OF OF or OF F, and hold the brand’s documented buttons with the door open to exit it.
How much does it cost to fix a refrigerator that stopped cooling?
A relay or fan repair often costs under 50 dollars, while a sealed system or compressor replacement typically runs 700 to 1,250 dollars with parts, labor, and refrigerant.
Should I repair this refrigerator or replace it?
Repair when the quote is under half the cost of a comparable new unit and the fridge is under about ten years old. Replace once both conditions flip.
Katie Lee has over 20 years of experience in the kitchen. She helps homeowners find the right appliances for their needs to sets up a perfect kitchen system. She also shares helpful tips and tricks for optimizing appliance performance.