My food saver VS6621 doae not seal anymore.

Based on the information provided, it sounds like there may be an issue with the heating element of your FoodSaver VS6621, which is preventing it from sealing properly. Here are a few things you can try to fix the problem:

1. Clean the sealing strip: Over time, the sealing strip on your FoodSaver can become dirty or worn, which can prevent it from creating a proper seal. Try cleaning the sealing strip with a damp cloth to remove any dirt or debris.
2. Check the heating element: As you mentioned, the resistance of the heat wire was zero, which may indicate that the heating element has failed. If this is the case, you may need to replace the heating element. Check the manufacturer's website or manual for instructions on how to do this.
3. Check the vacuum channel: If the vacuum channel is clogged or dirty, this can also prevent the FoodSaver from sealing properly. Try cleaning the vacuum channel with a damp cloth and ensuring that it is clear of any obstructions.