When I built my Emerson house and plugged all the wires together, with baited breath waited for there to be light and....nothing. After checking coneections, emailing Brinca Dada (and NEVER hearing back by the way), I finally decided to dig around inside the secret panel in the chimney. I swapped out the batteries and Voila! it worked. A solar paneled small house is pretty cool. I have since disconnected the two halves of the house because its just too damn heavy to move around when its together.