You must never exceed 100 PSI . Doing so can rupture the cylinder or cause misfires.
This is usually caused by the tool bouncing. Apply more pressure to the head of the nailer. If the issue persists, the internal return spring or driver blade may be worn. For internal reassembly help, experts at JustAnswer provide detailed guidance on spring and motor alignment. Task Force Brad Nailer Ett3212n Manual
If you have lost the physical manual, follow these step-by-step instructions exactly as they appeared in the original documentation. You must never exceed 100 PSI