Does it try to vacuum but never flattens the bag? Make sure the bag you are using is completely sealed on the opposite end. Otherwise, the seal on the sealer is probably allowing air to leak into the sealer. If it has a foam sealer, I've found it sometimes helps to run the foam sealer under water, squeeze out the excess water, reinsert the foam sealer (make sure it is seated all the way) and then try again to seal the bag.
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