Our frigidaire dishwasher's heating element will not turn off. If we close the door at all to it, it starts heating up, even without a cycle being turned on. We have to keep the door wide open so that it doesn't turn on. What is wrong, what parts do we need, and how do we repair it? Also, we don't have an owners manual since we purchased the house with the appliances already in it.

Thanks,
Tiffany