Stove only works when Heater is Running

[BILLBama]

I have a 2016 BH250 Pioneer by Heartland, first my Frig went out and now the stove only works with the heater in full operation. Now living in southern Alabama this summer we did not use the stove. When the heater meets the temp set on the thermostat and shuts down the stove goes out. Any thoughts beyond replacing the regulator? HELP!