No Carrier Issue can be related to weight ranges.

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I had two customers say they could not check out because of a "no carrier for address" error. All other orders were fine. I realized both customers wanted the same item, so obviously the issue was specific to that item. Scratched my head a few times and thought I would adjust the item weight, and that was the issue.

 

If a product weight matches the carrier weight range exactly it will cause an error. In my case the item weighed .8125 or 13 ounces.  My USPS First Class weight range maximum is also .8125, Presatshop didn't like it. Lowering the product weight slightly below 13 ounces fixed it and the item still ships on the cheaper First Class Mail rate. I just lowered it slightly.

 

So if its just one product thats giving you issues and everything else ships fine, make sure the weight is not exactly at the weight range limit of the carrier. I didn't notice the issue untill those two customers chose that exact product alone, most of the time people order multiple items and it took a while for the single orders to reveal the weight problem.