Why Is My Mini Fridge Not Cooling? Technician's

Quick Answer

If your mini fridge isn't cooling, the most likely cause is a buildup of dust on the condenser coils or a failed compressor start relay. Start by checking if you hear a clicking sound every few minutes, which usually points to a bad relay that needs replacing.

Mini fridges die young because people suffocate them. Shove one in a dorm closet or under a desk with no airflow and it'll fry the start relay in a year or two. If you're hearing clicking every few minutes, that's usually a $10 fix you can knock out yourself in 20 minutes. Ignore it long enough and the compressor seizes, and then you're buying a whole new fridge instead.

GenericRefrigeratorSeverity: highDifficulty: intermediate75% DIY Success

Time to Fix

20–45 min

Difficulty

intermediate

Parts Cost

$8 – $25

Tools Needed

Phillips #2 screwdriver, Flat head screwdriver

Why Is My Mini Fridge Not Cooling? Technician's

Fixing a mini fridge usually comes down to one question: is the compressor dead, or is it just a cheap part? Most of the time it's a $10-$20 relay or thermostat and you're back in business in under an hour. But if the compressor's seized or the refrigerant leaked out, don't bother with repairs. You're better off just getting a new unit and calling it a day.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Dirty condenser coils (airflow restriction)35%

Failed compressor start relay30%

Faulty cold control thermostat15%

Blocked evaporator fan10%

Sealed system or compressor failure10%

Symptoms You May Notice

You hear a clicking sound every 3-5 minutes, like someone flicking a light switch. That's the overload protector tripping because the compressor keeps failing to start.
The light inside works fine but you could put a warm beer in there and it'd stay warm.
The back of the unit is hot enough that you can't hold your hand on it for more than a second.
There's a solid layer of frost on the internal cooling plate but the rest of the fridge is completely room temperature. Fan's dead or iced over.
The compressor hums for about 30 seconds, clicks off, waits a few minutes, then tries again. Just keeps cycling like that.

Can you reset a Generic refrigerator to clear the NOT-COOLING code?

Unplug the fridge and leave it sitting for at least 10 minutes. Don't just unplug and replug immediately. The compressor's internal thermal protector needs time to cool down or you'll just trip it again right away. When you plug it back in, turn the thermostat to max cold. Give it 20-30 minutes. If the compressor starts humming steady without clicking off, you probably just had an overheating issue from poor airflow.

Tools Required for Diagnosis

Phillips #2 screwdriverFlat head screwdriverDigital multimeter (continuity and ohms settings)Vacuum with brush attachmentStiff paintbrush

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test

Expected Range0–50 ohms

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Universal Compressor Start Relay (PTC)QP2-4.7 · $8–$15	QP2-4.7	$8 – $15
Cold Control ThermostatWPF22A · $12–$25	WPF22A	$12 – $25

Frequently Asked Questions

Why is my mini fridge making a clicking sound but not cooling?

That clicking is the thermal overload protector tripping over and over because the compressor's trying to start but can't. Nine times out of ten that means the start relay is dead. It's that small black cube plugged into the side of the compressor. Pull it off, give it a shake near your ear. If it rattles, that's your problem. I replaced three of these last Tuesday alone. New relay runs $8-$15 online, just search your model number plus 'PTC relay' and it comes right up. Twenty minute fix, no special skills needed.

Can I use a mini fridge in a garage?

Honestly, most mini fridges aren't built for it. When summer temps push above 90 degrees, the condenser can't shed heat fast enough and the unit either shuts down or burns out the compressor over time. And in winter, if it drops below 50 degrees, the thermostat stops calling for cooling because it thinks the ambient temp is already cold enough. Your food actually warms up instead of staying cold. Check the spec sheet for the operating temperature range. Most say 60-95 degrees Fahrenheit, and they actually mean it.

How much space does a mini fridge need for ventilation?

Minimum 3 inches on the sides and back, at least 1 inch on top. And if it's sitting on carpet, that's making things worse because the carpet traps heat underneath. Tile or hardwood is way better. If you absolutely have to put it in a cabinet or built-in space, there needs to be real ventilation built in, like cutouts or a fan moving air. Otherwise you're basically building a little oven around your fridge and then wondering why it keeps dying every two years.

Is it worth fixing a mini fridge that isn't cooling?

Depends entirely on what's wrong. Start relay or thermostat? Fix it. Parts are $10-$20 and you can do it yourself in 30 minutes. But if the compressor seized or the refrigerant leaked out, don't bother. A decent new mini fridge is $80-$150 and that's way less than a compressor replacement or refrigerant recharge would run you. Do the cheap electrical tests first before you make that call. You might be 20 bucks away from another five years out of it.

How long should a mini fridge last?

A well-maintained mini fridge should get you 8-10 years easy. The thing that kills them early is almost always poor ventilation. Units shoved into tight spaces cook themselves from the inside out. Clean the coils once a year with a vacuum, make sure the door seal is tight (do the dollar bill test: close the door on a dollar and pull it out, you should feel some resistance), and give it room to breathe. I've seen dorm mini fridges die in 18 months from running in a hot closet, and I've seen the same brand last 12 years in a basement with good airflow.

Same Fix on Other Brands

Danby refrigeratorNOT-COOLING: Danby Mini Fridge Not Cooling Troubleshooting Frigidaire refrigeratorNOT-COOLING: Frigidaire Compact Refrigerator Cooling Issues

Models Known to Experience NOT-COOLING Errors

This repair applies to most Generic refrigerators with this error code. Common model numbers include:

LRE1245W, HSR1750B, MCBR440S, DCR032C1BDB, CR45-09, BCRK32B, RFR320-B, FFPE3322UM

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on May 20, 2024