Posted on April 30 2025
We’ve all been there. You’re in the middle of sealing a bulk batch of chicken breasts or your garden’s last harvest, and suddenly—the bag won’t seal, air keeps creeping back in, or the machine sounds like it’s struggling. Don’t worry. These hiccups are common, and often they’re easier to fix than you might think.
Here’s your go-to guide for troubleshooting common vacuum sealing issues—so you can keep sealing like a pro.
1. The Seal Isn’t Holding – Air Leaks Are Creeping In
The frustration: You vacuum the air out, seal it shut, and then… hours later, the bag has puffed up again. That dreaded soft bag means air’s gotten back in.
What’s likely happening:
- There could be a wrinkle or a bit of food in the sealing area.
- The bag might be punctured—especially if you're sealing items with sharp edges like bones or dry pasta.
- The seal wasn't complete due to moisture, oil, or grease on the edge of the bag.
Fix it:
- Always check that the sealing strip is clean and dry.
- Smooth out any wrinkles before sealing.
- For sharp items, wrap them in parchment or paper towels before sealing.
- Consider double-sealing (adding a second seal just above the first) for added protection.
2. The Machine Isn’t Vacuuming Properly
The frustration: You hit the vacuum button, but nothing seems to be happening—or the suction is way weaker than usual.
What’s likely happening:
- The bag isn’t properly placed in the vacuum channel.
- The gasket (that rubbery ring around the chamber) might be dirty or worn out.
- The lid may not be locking or closing fully.
Fix it:
- Make sure the open edge of the bag is placed fully inside the vacuum channel.
- Clean the gasket regularly and check for cracks or flattening—replacement gaskets are inexpensive and easy to install.
- Ensure there’s nothing preventing the lid from closing flush—crumbs, grease, or a bag edge can do it.
3. The Bag Won’t Seal at All
The frustration: You’ve pressed the seal button. You wait. You smell… nothing. The heat strip isn’t doing its job.
What’s likely happening:
- The machine may need a cool-down period between seals.
- The sealing strip might be dirty or damaged.
- The bag you’re using might not be compatible or is too thick/thin.
Fix it:
- Most machines need 20–30 seconds to cool down between seals—don’t rush it.
- Wipe down the sealing strip with a damp cloth, and inspect it for wear.
- Use high-quality, multi-layer vacuum bags that are designed for your machine (like our FoodVacBags rolls and pre-cut bags!).
4. Moisture Is Interfering With the Seal
The frustration: When sealing marinated meat or fresh fruit, you notice liquid creeping toward the seal—and weakening it.
What’s likely happening:
- Liquid is being drawn out during the vacuum process and disrupting the seal.
Fix it:
- Freeze liquids or moist foods for 1–2 hours before sealing to reduce seepage.
- Use the "moist" or "gentle" setting, if your sealer has one.
- Upgrade to Liquid Block Vacuum Seal Bags—they feature a built-in absorbent strip that traps excess liquid and protects the seal without compromising the vacuum. No mess, no leaks—just a strong, reliable seal every time.
5. Your Sealer Just Stopped Working Mid-Session
The frustration: You’re on a roll, and suddenly your vacuum sealer won’t turn on or operate.
What’s likely happening:
- It might have overheated after repeated use.
- The power connection could be loose or the machine needs a reset.
Fix it:
- Unplug it and give it 20–30 minutes to cool down.
- Double-check the outlet, plug, and power cord for damage.
- If the machine is still unresponsive, check the manual for reset options or fuse locations.
Final Tips for Long-Term Vacuum Sealing Success
- Clean your machine regularly. A quick wipe-down after each use goes a long way.
- Replace gaskets and sealing strips when they wear out.
- Use quality bags. Not all bags are created equal—ours are BPA-free, heavy-duty, and built to last.
Vacuum sealing should make your life easier—not more frustrating. With these tips, you'll be sealing efficiently and confidently, minimizing waste and maximizing freshness.
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