Im not exactly sure on this.....but i'll try my best to give you a lil help. The fan coming on in the middle of the night, might have something to do with your fan timer switch, this is one of the sensors on the thermostat housing extension. I believe its the blue one, but im not positive on this. Maybe you could try disconnecting this over night, and see if it doesn't come on during the night. But this is just a guess, i've never actually heard of this happening before. And for the speakers not making any sound.....this is probably an install problem. Might wanna make sure you didn't drill any screws through the wiring in the door, and also make sure the speaker terminals aren't sitting against any metal in the door. Good luck on figuring this one out.