I have a central air / heater problem and I hope someone can help me out. I have a gas heater although I don't know the make or model of it at this time. The problem is this, when the temperature gets to where the heater is suppose to turn on. I hear it come on and within about a minute it shuts down before the blower goes on, then it does this again and I guess locks up for awhile.

I am thinking that it might be a sensor but am not sure. Thanks for any help