Better return it fast!!!.
Two out of three rentals have not worked properly. Once the job was only half finished when machinery broke down, the other rental didn't do me a bit of good. AAA rentals would not offer partial refund on the first, and no refund on the second item. They told me that it had been out of the shop too long for a refund despite the fact that the item rented didn't work. So basically I paid to pick up stuff, not use it, and return it.