Disclosure: As an Amazon Associate we earn from qualifying purchases. We may earn a commission if you buy through our links, at no extra cost to you.
The short answer: Your slow cooker may not be heating up due to a faulty power outlet, a damaged cord, a blown fuse, or a malfunctioning heating element. Before you panic and buy a new one, there are several simple checks you can do to diagnose the issue. In many cases, the fix is easy and free. If not, it might be time to consider a replacement. For a curated list of reliable models, check out our best slow cookers buying guide.
For specific models worth considering, see our ranked list of the best slow cookers.
When your slow cooker refuses to heat, the first step is to rule out the simplest explanations. Start with the power source. Plug another appliance into the same outlet to see if it works. If not, the outlet could be dead. Try a different outlet. Also, check if the outlet is controlled by a wall switch that might be off.
Next, examine the power cord. Look for any visible damage, like cuts, frays, or exposed wires. If the cord is damaged, do not use the cooker. Contact the manufacturer for a replacement cord or consider a new unit. Also, ensure the cord is firmly plugged into the cooker and the outlet. A loose connection can cause intermittent heating.
Many slow cookers have a fuse or a reset button, often located at the bottom. Check if the fuse is blown. If you have a multimeter, you can test for continuity. If the fuse is blown, replace it with the same rating. Some models have a thermal fuse that trips if the cooker overheats; unplug it and let it cool down completely, then try again.
Make sure you have selected the correct setting. Some slow cookers have a ‘warm’ setting that may not heat as intensely. If you set it to ‘low’ and expect it to boil, you might be disappointed. Check the user manual to see if you need to set a timer or start button. For digital models, ensure the display is on and showing the selected time. If the display is blank, the unit might not be receiving power.
Also, verify that the lid is properly sealed. While not a heating issue, a loose lid can let heat escape, making it seem like the cooker isn’t working. The heating element is usually at the bottom, so if the inner pot is not sitting correctly, it might not make proper contact.
If the power source and settings are fine, the problem could be internal. The heating element itself can burn out over time. This is not something you can easily fix at home. If your cooker is old and has been used heavily, this might be the cause. A thermal fuse is a safety device that cuts off power if the temperature exceeds a safe limit. If it trips, the cooker will not heat. To test, you need a multimeter. If it’s blown, you can replace it with a soldering iron, but this is not a beginner-friendly task. If you’re not comfortable with electronics, it’s safer to replace the unit.
If your slow cooker is relatively new and still under warranty, contact the manufacturer or the store where you bought it. They may offer a repair or replacement. Do not attempt to open the cooker yourself, as it might void the warranty. Keep your receipt and serial number handy.
If your cooker is old, and the cost of repair is high or parts are hard to find, it might be time to invest in a new one. Also, if you’ve tried the troubleshooting steps and nothing works, there’s likely a serious internal issue. When shopping for a replacement, look for features like programmable timers, multiple heat settings, and good reviews. For an honest comparison of popular models, see our best slow cookers guide. It can help you choose a reliable cooker that will last for years.
If you are replacing a slow cooker that no longer heats, or buying your first one, size and shape matter more than many shoppers expect. Slow cookers are sold by volume, typically from 2 quarts for singles or couples up to 8 quarts or more for large families or batch cooking. As a rule of thumb, a 2 to 3 quart model suits one or two people, a 4 to 5 quart model fits three to four, and a 6 quart or larger model works for five or more or for making leftovers. Buying too large a cooker for small meals can cause food to cook unevenly because the pot is not full enough, while buying too small means you cannot fit a whole chicken or a large batch of chili.
Shape also affects performance. Oval cookers accommodate roasts and whole birds better, while round models tend to heat more evenly for soups and stews. Consider whether the inner pot is removable and dishwasher safe, and whether the lid has a tight seal and a steam vent. A locking lid is useful if you plan to transport the cooker to potlucks. Also check the cord length and whether it can be wrapped for storage. These practical details often matter more than extra features you may never use.
Many heating failures start with poor maintenance. Always unplug the cooker before cleaning. Never immerse the base, cord, or plug in water. Wipe the exterior with a damp cloth and mild soap, and dry thoroughly. If the inner pot is removable, wash it according to the manufacturer’s instructions; most ceramic or nonstick inserts are dishwasher safe, but some require hand washing to preserve the coating. Avoid abrasive cleaners that can scratch the surface and cause food to stick, which leads to burnt spots and uneven heating over time.
Do not use the cooking pot on a stovetop or under a broiler unless the manual explicitly says it is safe. Thermal shock, such as adding cold water to a hot ceramic pot, can crack the insert. Store the cooker with the lid off or ajar to prevent odors and mold. Check the cord regularly for damage, and avoid wrapping it tightly around the base, which can strain the wires. If your cooker has a gasket or seal, inspect it for wear and replace it if it becomes brittle or loose. These habits can extend the life of your slow cooker and reduce the chance of a sudden failure.
Sometimes the cooker is working fine, but user error makes it appear faulty. One frequent mistake is overfilling the pot. Slow cookers need headroom for heat to circulate; filling beyond the recommended maximum can prevent food from reaching a safe temperature. Another is underfilling: a nearly empty pot may not heat evenly because there is not enough mass to distribute warmth. Follow the manual’s fill guidelines, usually between half and three-quarters full.
Another common issue is lifting the lid. Each time you remove the lid, heat escapes and cooking time increases, sometimes by 20 minutes or more. Resist the urge to stir frequently; most recipes do not require it. Also, ensure the cooker is placed on a flat, heat-safe surface away from walls and curtains. Some models have a polarized plug that fits only one way; if it does not plug in easily, do not force it. Finally, check that the control dial or buttons are set to the intended function. A cooker set to ‘warm’ will not cook food, and a digital model may need you to press start after setting the time. These simple oversights account for many false alarms.
If the cooker is heating but food isn’t cooking as expected, check the temperature. Some cookers run cooler than others. Make sure you’re using the correct setting and that the lid is on properly. Also, avoid opening the lid frequently, as this releases heat. If the problem persists, the heating element might be weakening, and it may be time to replace it.
Replacing the heating element is possible for some models, but it requires disassembling the cooker and soldering. It’s risky and not recommended unless you have experience. If you’re not confident, it’s safer to buy a new slow cooker.
With proper care, a slow cooker can last 5 to 10 years. If you use it frequently, the lifespan might be shorter. Regular cleaning, avoiding thermal shock (like adding cold water to a hot pot), and storing it properly can extend its life.
We don't accept free units or payment for placement. Our rankings combine verified manufacturer specifications, real owner feedback and availability, compared on one transparent S to C rubric.
Honesty note: We have not hands-on tested every product mentioned on this page. Where we have not personally used a product, any ranking referenced here is based on verified specs, aggregated owner feedback, availability and editorial comparison rather than a hands-on review.