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That is usually a bad timed delay relay. It is supposed to allow the furnace to cycle and doesn't and keeps the motor running. It can also be a bad thermostat that won't allow the furnace to shut down when it reaches the set temp. I am attaching a link to the Atwood Hydroflame manual for you. Print out a copy or at least Bookmark it so you can come back to it again any time. See the section on the timed delay relay. This can be tested and I can direct you in that if you plan in fixing this yourself. All follow ups are included in our fee. http://bryantrv.com/docs2/docs/hflamefurn04.pdf
If you need more on this, please include the actual model number off your data plate so I know what you have here.
I am adding the older version of the manual which covers the FA models which you may have. http://bryantrv.com/docs2/docs/hydroflameold2.pdf
Let me know if you have an old pilot valve version as they work somewhat differently..........and I can tell you that parts for those are getting harder to find.
Boy..........I'll say! If this isn't the thermostat, I think you may have to consider upgrading to a newer version. I am pretty sure that there won't be any parts for that old a unit. Is this a heat only thermostat?
I think on that model it is the white knob......or do you have a wall thermostat someplace?
Perhaps...........what setting is that white knob on? Isn't that adjustable?
Then it isn't cycling and I don't think you can find a part for that, but perhaps take a look on E-bay as some older parts are available there. What is the actual model number off the data tag?
Is this an RV model or perhaps is this a mobile home version?
It should have a tag on there that is visible where it says "Hydroflame" and model number.
It does, but doubtful it is the issue and I believe it is attached to the gas valve and not a separate part. I think you just need to upgrade to a newer unit.