Electric hand drills begin their drilling movements by triggers which are almost always located by the handle. However, due to certain electrical malfunctions, occasionally these drills will sometimes not stop running when the trigger is released. This can cause injury to the person using the drill and also make the drill almost impossible to use. In particular, this occurred with the Bosch Hammer Drill, forcing a recall of 9,700 Bosch hammer drills. There was a defect in the trigger switch for the drill and the spinning would continue until the drill was unplugged or it overheated and shorted out, possibly causing a fire. To solve this issue, the switch on the drill must be replaced so that it shuts off when it is released.
Cordless drills utilize batteries that allow the drill to be carried to and used in a variety of areas without the concern of cords getting in your way. However, these batteries are sometimes defective and can channel energy to the wrong areas of the drill. This can cause the battery to overheat while it is being used and possibly cause the hand drill to explode.
Sometimes electric drills stop working though they are equipped with a fully charged battery and the motor is audibly running. This can be due to a number of different reasons but is most likely due to the drill being jammed by dust, dirt and debris that may have accumulated inside the electronics and mechanics of the drill itself. If you have been using the drill amidst heavy construction where there are large amounts of sawdust, paint or dirt, you will probably need to periodically take the drill apart and clean it. Without doing this preventative measure, the drill will not run properly and can overheat, burning out the motor and other electronics inside of it.