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HI my name is Robert...
SO are you talking about only the furnace? You mention fan which the furnace has but so does the AC unit... OR they are both not shutting down the AC fan and furnace fan?
SO.... Normally when the furnace will not shut down it is the circuit board on the furnace or a time delay relay, on newer models the time delay relay is part of the circuit board older models have a time delay relay, what I find odd is the AC is doing the same thing which leads me to believe that the circuit board inside the AC unit is at fault. What is the make and model of the frnance and do you have a volt meter?
DO you have a volt meter and what is the make and model model of the furnace?
I am thinking the circuit board on the furnace could be at fault however it also could be the control box for the AC unit. IF you do not have a volt meter I would have a RV shop test the circuit board with a tester, most RV shops have the testers and some will even check them for free. IF the board checks out good on the furnance then I would replace the control box inside the AC unit since you replaced the thermostat. Robert
HI.... I see you have not selected a rating, if you still need more help please let me know, I am around daily and respond when I can.....
I am going to need the make and model of the furnace.
Normally you will have a blue wire going to the circuit board from the thermostat, when the thermostat is off you should have no power on that blue wire at the circuit board for the furnace. IF you do not have voltage then the board most likely is at fault OR if you have that time delay relay, if you have voltage then normally the thermostat is bad. I also want to dig a little deeper into the control box for the AC unit and see if that can possibly be at fault...