caws1111

We have a Borg Warner natural gas hot air furnance and it has been turning itself off, basically not firing itself up when the temp goes below the designated amount. We have a new thermostat which is not the problem. On the outside of our furnace box is a switch that turns the power to the furnace on and off. When the furnance wont kick on I have checked the pilot light and it is fine. When I turn the switch to off and back on, it kicks the furnace back on and fires it up. So I think the problem is with the switch or the connection of that mechinism inside the furnace. I have read somewhere that the mechisim or conductor may need cleaning. the furnance is 15 years old and we have had no other problems with it. Also once we flip that switch off and on again it works for several days, then does the same thing over again. Has anyone heard of this problem and does anyone know how to solve it.