Common causes:

❗ Sealing issue

• Always cut the bag to the desired size before sealing — do not seal first.
• Place the bag outside the unit with only the open edge on the sealing strip, then seal one end.
• After that, add food and vacuum seal the other end. This ensures a tighter and more reliable seal.

❗ Food-related issue

Some foods naturally release gas over time (fermentation).This can cause the bag to expand

This usually happens due to heat or mode selection.

Possible causes:

• The sealing strip is too hot (from continuous use)
• The bag edge melts early and blocks airflow
• Moist mode is being used (lower suction by design)

What to do:

• Let the machine cool down
• Use Dry mode if suitable

Why won’t the bag vacuum at all?

Check the following:

• Only textured vacuum bags are supported
  
• The lid is fully closed and locked
  
• The hose (for canister use) is removed
  
• The bag is properly placed inside the vacuum channel

The machine will only start sealing after reaching the required vacuum level.

If it keeps vacuuming but never seals, it usually means air is leaking and vacuum cannot be achieved.

🔴 Most common cause: The bottom of the bag is not sealed properly

In most cases, this happens because the bottom seal of the bag is not fully airtight.

⚠️ Important (how this machine works)

This machine is designed so that even in Seal Only mode,
it applies slight vacuum pressure to press the lid down more tightly during sealing.

👉 This helps create a stronger and more reliable seal

❗ Common mistake

Many users:

• Seal the bag first
  
• Then cut it afterward

This can cause the bag to shift during sealing,
resulting in a weak or uneven seal that may leak air.

✅ Correct method (very important)

To ensure a proper seal:

1. Cut the bag to the desired size first
   
2. Place the bag outside the vacuum chamber, with only the edge on the sealing strip
   
3. Close and lock the lid firmly
   
4. Press Seal Only to seal the bottom
   
5. Then proceed to vacuum the other side
   

🔍 Why this matters

If the bottom seal is not airtight:

• Air will continuously leak into the bag
  
• The machine cannot reach the required vacuum level
  
• As a result, it will keep vacuuming and never start sealing

🟠 Other possible causes:

• Lid not fully locked
Even a small gap will prevent proper vacuum

• Bag placement is incorrect
The open end must be flat and fully inside the vacuum channel

• Moisture or debris on sealing area
Water, oil, or food particles can break the seal

• Worn or misaligned gasket
The foam/silicone gasket must sit properly to create an airtight chamber

🟡 Additional note:

Some foods may naturally release gas over time (fermentation),which can affect vacuum performance.

✅ Quick checklist:
✔ Bottom of the bag is fully sealed
✔ Bag is flat and wrinkle-free
✔ Lid is tightly locked
✔ Sealing area is clean and dry
✔ Gasket is properly aligned

H1 indicates the machine is overheating.

This usually happens when multiple cycles are run too quickly.

👉 The machine will automatically stop when the temperature is too high (above ~85°C)
👉 It will resume working once it cools down (below ~65°C)

What to do:

• Open the lid and allow the machine to cool
• Wait a few minutes (cooling time depends on environment)

Tips:

• Unplug and restart to speed up recovery
• Avoid continuous use without breaks
• Use Dry mode when possible to reduce heat buildup

Possible causes:

• The lid is not fully closed or locked
  
• The bag is wrinkled or not flat
  
• The bag is not properly placed in the vacuum channel
  
• The sealing edge is not fully sealed
  

What to do:

• Make sure one end of the bag is completely sealed
  
• Place the open end flat inside the vacuum channel
  
• Smooth out any wrinkles
  
• Close and lock the lid firmly on both sides

No worries.
Please contact our support team — we’ll respond promptly and take care of everything.
Whether it’s a replacement, return, or technical support, it’s completely hassle-free.
We always stand behind our products.

Premium customer service: support@liwunon.com