[Arthur Hayes]

I had to replace mine a few years ago. On this unit it is located under the bed close to the transfer switch. It is about the size of a CB radio, it has a fan that runs 24-7. Easy to remove and replace. Just pay attention to how the wires are connected. I called the manufacture and they offered a rebuilt one, that is what I ordered. You can find them on many web sites as well.
Good Luck