This could be because the nozzle has become blocked by liquid butane. The most common cause of a blocked nozzle is overfilling of the tank. The tank is full when liquid butane gas escapes from the filling valve. Once this happens please stop refilling the gas to avoid overfilling of the tank. Please refer to the (RE)FILLING THE TANK section of the Versatip manual for more details. If the problem persists, unscrew the Metal Flame Guard. Then unscrew the Ceramic Insulator. Remove the Nozzle with a set of pliers and allow the liquid butane inside the nozzle to vaporize by holding the nozzle for 30 second and then reassemble the components. If a problem persists beyond these suggestions, please contact us so we can provide guidance on getting your tool to us so we can take a closer look at it.