Last summer my husband put a new digital thermostat in. Our old one was the round Honeywell. The new one he got is also a Honeywell. He had 4 wires to put in. He got it all back together and it worked great. Now it is cold, and I have switched the thermostat to Heat and fan to auto. I turned the thermostat up 3 hours ago and the furnace will not come on. Could it have anything to do with the digital thermostat?