Replace the trigger valve part # 647956-00 to solve this problem. If you have access to very small orings (2mm x 1.5mm), try replacing the two orings on the trigger valve stem. Dewalt uses vinyl orings on the trigger stem and they fail causing malfunction. Easy fix however and not expensive . Good luck
SOURCE: Nailer jams with 1-5/8 brads
It sound to me that the 1 5/8 brads are not 18 guage but probably 16 guage and they will not work. Double check them first before going any further. You can usually lay them next to the smaller ones that work and see the size difference, if not let me know and I will dig deeper.
SOURCE: DEWALT 16 GAUGE ANGLE NAILER WONT FIRE BUT THE
If the light keeps flashing then the battery is not charged enough to fire the gun. recharge the battery or buy a new one if it continues.
SOURCE: nail gun wont fire
First - the air pressure has to be high enough - check the regulator on the tank to make sure it is delivering in excess of 60-70 psi (which I am sure you have already done).
If you have dry fired these guns (i.e. shot them off with no nails in them while you were lubricating them maybe) the mechanism inside could be damaged. I had that happen to one of my nailers (same brand). That was when I learned not to dry fire them...
Since both of them are not working though I would be more inclined to look at the air supply first.
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