Do you have an IOTA currently? Doing some research on the motor home forms the brands that seemed to have the most good comments were, ESCO, ERMCO and Powermax furion. I have not needed to replace mine to this point but IOTA does not get very good comments.

Hope this helps.

Before you change it.....have you checked all relays within the transfer box.......also the board is repairable thru dinosaur boards fairly cheap and fast.....

I'm currently using a TRC transfer switch. The original Iota burned, the replacement Parallax would hang up and not let power thru on either side. It met its fate by not switching over about 6 weeks ago.