The same thing happened to mine and I found a really,really inexpensive way to resolve it. I don't use original foodsaver bags and I found out that their thickness might not be detected correctly so it won't vacuum. To compensate for this, I used an ordinary piece of notebook paper. I cut it to a size of 4 1/2" by 1 1/2". I set the long side in the middle of the liquid catching tray and let it lean back towards the heat strip. Make sure it doesn't cover the heat strip or it won't seal. Now I inserted the bag as the directions say, close and lock the top, and it vacuums and seals perfectly. 
Vacuum/sealer is not vacuuming
SOURCE: Foodsaver Food Sealer Vacuum V2240 T: Foodsaver Professional II Turbo. Vacuum pump work...
This is likely happening because the unit cannot detect that a vacuum has formed, and as a result, the unit never "turns on" the heating element to seal the bag, with the gaskets around the vacuum channel being the probable culprit. The Foodsaver gaskets will deform and/or dry out with time, just like in any device, but you don't necessarily have to replace them. I've tried this inexpensive solution on my own Foodsaver V2490, and it works perfectly.
Buy some food-grade silicone grease and apply it to both the upper and lower gaskets. I remove the gaskets and coat both sides with a thin layer of grease before replacing them in their respective channels. And since this grease will be absorbed and/or dry out with time, you will have to do this occasionally, so I also flip the gaskets (i.e. turn them over) whenever I apply the grease.
You can buy a 2 oz container of silicone grease at any dive store, or you can buy it over the Internet by searching for "Trident silicone grease".
This is a link where you can buy it for around $7.00:
Dolphin Dive Center
I do not work at this dive center, but I am a scuba diver and already had some grease that I use for the numerous rubber gaskets in my gear. The 2 oz. jar will last you several years, and you will find many other uses for it around the house since the grease will last longer than a spray.
SOURCE: I have an older model Foodsaver. The machine will
This is likely happening because the unit cannot detect that a vacuum has formed, and the gaskets around the vacuum channel are the probable culprit. The Foodsaver gaskets will deform and/or dry out with time, just like in any device, but you don't necessarily have to replace them. I've tried this inexpensive solution on my own Foodsaver V2490, and it works perfectly.
Buy some food-grade silicone grease and apply it to both the upper and lower gaskets. I remove the gaskets and coat both sides with a thin layer of grease before replacing them in their respective channels. And since this grease will be absorbed and/or dry out with time, you will have to do this occasionally, so I also flip the gaskets (i.e. turn them over) whenever I apply the grease.
You can buy a 2 oz container of silicone grease at any dive store, or you can buy it over the Internet by searching for "Trident silicone grease".
This is a link where you can buy it for around $7.00:
Dolphin Dive Center
I do not work at this dive center, but I am a scuba diver and already had some grease that I use for the numerous rubber gaskets in my gear. The 2 oz. jar will last you several years, and you will find many other uses for it around the house since the grease will last longer than a spray.
SOURCE: foodsaver V845 is not sealing?
Does the vacuum seem to run forever and it doesn't seal?
Clean the black foam seals
Replace them if needed. they can be purchased from Tilia
WWW.FOODSAVER.COM
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