If the piston is not seized its usually the trigger assemblythe trigger valve switches to both engage and retract the piston
Senco nailers are very reliable however could suffer from several issues that would cause your problem. Here are a few things to check that may solve your problem. Bent driver, worn parts, broken check valve. Main problem with all finish nailers is bent driver blade. Easy to check, remove and examine. The driver should travel length of cylinder without jaming. Driver oring/plastic ring should fit snug into cylinder. Remove cylinder and check the oring neer the bottom of the cylinder. This is a check valve. There are small holes that should be cleaned. If oring is loose or broken just use any oring that fits snuggly. Next, check that lower bumper is not chipped or cracked and that washer under bumper is not too worn or missing. Replace parts as necessary. (www.toolpartsdirect.com)
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