There is also a place in Seattle that fixes them. I don't have the info with me so I will get it posted when I get home. Most of the time it's a vaccuum sensor switch on the inside that gets gooped up from liquids-vapors that causes the problems. Pull your unit apart you'll see the switch as there are few parts inside these baby's. The place in Seattle said they can also replace the sealer strip if required. I think for the money I'm going to upgrade and buy one of the commerical type. Between $300-$500 dollars, look on the web there are lots of them out there.