Nail not firing, battery charged, fuel cell good,

First thing is , when did You clean it last?

I've used paslode for years and whenever there was a "hiss" of air and no fire- it was o-rings- When were the o-rings changed last? And how do you know they are in 'good shape'? You can't tell by just looking at them. If that isn't the problem then I can't help. Just as an aside- do you oil the gun (down the air intake nipple) every time you use it? Lack of oil will wear out o-rings fast. Sorry if this isn't overly helpfull but most gun problems are o-ring or seal related unless you've worn out or damaged a mechanical part.

It needs to be cleaned and oiled. You can buy an electrical cleaner spray and oil specific for paslodes at Home Depot. You will have to take the back off (where the filter is) and clean it with the cleaning spray then oil it well. Put it back together and it will work like new again. You will be surprised how much difference it will make. Good luck

Rebuild gun with gasket repair kit.
How it works: Compressed air enters through air hose and fills gun cylinder.
When trigger is pulled, air inside cylinder rushes out and pushes firing pin that shoots nail.

Inside the gun there are gaskets that seal the nose, the trigger and the cylinder head.
When any of those three gaskets fail, then air starts leaking.

Putting a few drops of nail gun oil into gun before connecting hose is supposed to protect gaskets.
But everything wears out, and sometimes folks use 3-in-1 oil instead of gun oil.
3-in-1 is detergent type oil and will cause gaskets to fail.

Another thing is guns that are not used frequently and gaskets get dry.
Putting in a few drops of oil and then immediately shooting gun will cause gasket to fail, because gaskets are still dry.
Best to put in plenty of gun oil, and let oil go down into gun for a few hours before connecting hose and shooting. Even so, nail guns are designed to be used every few days with continual oiling.

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what is the expiration date on the bottom of the fuel cell?? Also what were the condition of the o rings and did you relube with a good quallity oil. What I would do is remove the front assembly to expose the fan only and then insert a battery, pull the trigger and the fan should run for a few seconds, next there is a roller lever towards the top, depress it keeping fingers away from fan and again it should run for a few seconds, next depress and hold the lever and then pull the trigger and you should see it fire, repeat this several times, that will narrow it down to the spark unit/electronic assenbly or the cylinder.

Orings /other parts tend to stick when nailer is new. Dewalt uses some vinyl orings that have been causing premature failure. Be sure to add a few drops of oil when used. Too much oil is not good. Wrong oil will cause orings to swell and cause problems such as yours. Your nailer's firing valve can be reset by rapping the nailer against rubber surface such as a thick rugger mat or coiled rubber air hose. Remove airline and nails, being carefull not to damage the head, rap had against rubber mat and retest gun. If it did not reset rap against nose of gun and test. If no joy, you will most likely need to remove head and manually move cylinder up/down and /or check vinyl orings for failure. Before you try to reset the gun, make sure that the safety is pushing the firing pin all the way in. Air removed, look under the trigger as you push down on safey, if it does go all the way in try bump-firing the gun (for test have nails removed). Hold in trigger and quicky /firmly strike gun against rubber pad. Good luck

piston is probably jammed

This happens sometimes try holding it up against a board with the trigger depressed and then inset the battery.

The goal is to try to force the firing sequence to get the piston back to the right position with corded units this is simply done by attaching the air hose with the trigger pulled this causes air to rush into the gun chamber pushing the piston back and firing a nail out.

The cause of this is a misfire or jammed nail that stopped the piston in the wrong location so air will not build in the chamber correctly.

Hope that helps

try a new battery m8 when they have been used fir a while they wear out at the catch and when u fire the nail gun the battery works its way out enuf to stop it making a good contact. Hope this helps.

have you activated the fuel cell by pressing the black nozzle down onto the cylinder?

Make sure the spark plug ignites. Take tool apart as in cleaning. Hold micr switch near fan and watch as you pull trigger. you will see a spark. If not check the lead to igniter