Insert the battery into the charger, with terminals facing downward. Wait for the red light on the charger to change to green, indicating that the battery is fully charged.
Clean battery terminals with a soft, dry cloth.
Try a new battery.
Try a replacement charger.
Press the bottom of the actuator cover at the back of the gun and pivot to open. Slide the fuel cell out and replace it. Close the actuator cover and snap it into place.
Press down and twist the air filter cover. Remove the cover and lift the air filter out. Gently tap to remove loose dust. If the filter is dirty, clean with soap and water, then replace the filter.
Remove the battery. Pull the follower back until it latches onto the rail cover. Push the latch on the front guide and pivot the guide forward. Manually clear any jammed nails. Return the front guide to its original position and ensure that it is latched into place. Release the follower.
Clean the nail track and remove loose debris.