My unit will kick on and heat and then it will just stop working. Indicater light on board shows solid red as if everything is normal. Any Ideas?

Also this is natural gas with a heat plug to ignite the gas.

Could simply be a dirty/faulty flame sensor. If the sensor goes bad or gets dirty the burners will ignite but then shut off after a few seconds. Does this sound like what you are experiencing?

I am having the same problem where is the flame sensor?