Could be several problems, are you using the right guage nails, is there a nail jammed in the nose assembly, is the driver bent or broken, I would look for a jammed nail first and if none then I would remove the cap and check the condition of the cylinder and piston. they have a bad habit of breaking the driver blade loose from the piston
SOURCE: My nail gun doesn't shoot nails when I push it to
Check the linkage from the head to the trigger. The drive pin may be jammed as well.
SOURCE: bostich gun problem
If the piston/driver is broken, the gun will fire however nailing will not take place because the piston will jam in the cylinder. Sometimes the cylinder will also crack when the driver goes. If the piston is not broken but stays down, then check the cylinder check valve, worn lower bumper, bent driver or cracked cylinder. 18 guage nailer has a very thin driver which will easily bend or break. Parts however are not expensive.
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