Heater wont stop running is the controller faulty?

No water or rain has gotten into the furnace or control panel, it works fine when the control panel is turned on asking for heat, it's when the control panel is turned off the furnace turns on by itself and won't shut off. I'm just wondering if its the electronic climate control panel under the fridge? I don't want to spend $200 and find out that's not the problem.

Has it by chance been exposed to rain/wash job? If so, there might be water at/on the "mother board". I had that happen to me after a gully washer came up one night-the heater made a gawd awful racket-like it tried to ignite and click whine to a certain degree. I removed the grate and unplugged the darn thing, to make it thru the night. Next morning took the outside cover panel off the furnace and found 'the culprit', water pooling on bottom of furnace floor, enough to reach the soldered prongs of the mother board. Dried it up and put some 1/4 inch peel em stick em weather stripping on the indented foam of the panel and reinstalled. BAM, no more issue. Hope this might help. And like you the furnace was NOT activated, in fact had the AC going....

When the controls are off the heater will run and blow heat. when I turn the heaters on from the control panel everything works properly, example set the thermostat to 70 degrees and the heater will turn on until the temperature reaches 70 degrees then will turn of. it runs as it is suppose to but when I turn the heaters to the off position after about 1 minute the heater starts on it's own and will not shut off?
Could it be the electronic climate control module? I heard it chattering badly then stop.
Thanks for any help you can give me. https://cdn3.volusion.com/afvyg.fwnkv/v/vspfiles/photos/591-200-Intellitec-2.jpg?1517381651

might read through this to see if it is any help!Manual

I have not heard of this. Is it blowing heat? My experience is if the heat does not come on the fan will blow non stop. Usually an indicator I am out of LP. So are you saying the thermostat is set lower than room temp and the heater comes on anyway? If so I would also suspect the thermostat