Sealing light blinking and no seal and vacuum

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: My foodsaver v2240 will no

On the lids underside, on the left and right, you will see two black rubber round bumpers. These are the switch activators. Use the back (not the tip) of a pen on push lightly on both sides you should hear a clicking sound when the switch makes contact. Sometimes they do get stuck and cause the vacuum not to finish it's cycle.

SOURCE: The V2240 does not seal

It's possible that liquid is getting into the sealer or the seal is dirty. Here's a link for a pdf that explains possible problems and solutions.

http://www.foodsaver.com/Manuals/MANUALS/T000-32030_44_65900646.PDF

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

SOURCE: 2240 unit vacuums but won't go into seal mode. if the seal button is manually pushed, it will then seal but the vacuum is lost

I am having the same problem, it is like the heating element for the sealer is broken.My unit actually will NOT seal if I push the manual seal, but the vacuum works.