For this job, the customers furnace kept running, even though the thermostat was satisfied. Then sometimes it will come on, then shut off a couple times. Even though the stat was satisfied. I found that the thermostat wire was hooked up to the universal thermostat Smart wire module, and when I unhooked it and just connect R and W the furnace seems to be working great. My recommendation to the customer was replacing the two wire that they got and add 18/6 wire. The customer gave me the OK to have that wire replaced. Both labor and part is under warranty and we would need to reschedule to come back. As of right now, the furnace is working.