As Don said, your coach & its original heater had the Motoraid feature, but your replacement does not. Either return the new one and get a Motoraid compatible in its place, or splice the two hoses together and do without the Motoraid feature. It's a nice convenience to arrive at your site with already heated water, but hardly a necessity.
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL