If a dishwasher isn’t working properly, the first thing to do is to check if someone put a pan or lid over the spray arm in the center of the dishwasher. Find out how paper can get trapped in the small holes on a dishwasher’s spray arm with help from a remodeling specialist in this free video on dishwasher problems. Expert: William Perkinson Bio: William Perkinson is a partner with Perkinson Building Corporation, based in Birmingham, Ala. Filmmaker: Tim Brown