This usually occurs when the head valve is worn, cracked or just needs lubrication. If the valve looks ok, then lube with white grease and test. If still no joy, make sure that the trigger firing pin is being pushed all the way in when attempting to fire. Make adjustment to safety foot. Good luck with the repair.
SOURCE: Porter Cable FR350 Round Head Framing Nailer not firing
check and make sure your compressor is at the right psi. 120psi. is there any nails stuck in it. there may also be a problem with the seals.
SOURCE: hitachi framing gun leaks air from trigger when pulled
use the lube that came with the kit, you can replace everything correctly but if oring gets pinched it will still leak
SOURCE: My new porter cable RN175B nail gun won't discharge a nail
If the trigger is set to single fire, you will need to place the gun against the work then pull trigger as you have done. Try setting the trigger to bump fire and try again. If hear a thump inside the gun, remove the head and check that the head valve in not stuck from lack of lubrication. Easy test, remove the nails, remove trigger pin, remove trigger and manually push trigger firing valve. If the gun fires then suspect faulty trigger or safety arm not lifting enought to activate the trigger valve. Good luck
SOURCE: I have a poter cable brad nailer and after running
Check the air pressure. Same thing happened to me. Figured out it was to high.
SOURCE: i have fr250c porter cable 16g finish nailer pull trigger and it don't shoot hear air leaking out
dry piston seal or piston stuck in part motion
allow a few drops of machine oil into the air inlet and see it that loosens it up
air tools should e lubricated in the air inlet fitting every day before use
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