I am attempting to install a replacement timer for my whole house fan. The old timer had a red, white, and black wire. The new timer has a red, black and blue wire. The house wiring has a single black wire, two white tied together and a red and black tied together. I thought I would simply hook black to black, red to red and black, and blue to white. When I turned the power back on everything was normal. I pressed the on button on the timer and.....darkness, blew the house circuit breaker. Any help would be appreciated.