Dayton 3E133 Infrared heater Unit using natural gas Works good but will not stop sparking Ran for two hours and still sparking Not real sure whats going on here? I dont think I have a continuous spark unit But I'm not sure I would think it would need flame sensor to know where it was lite and then stop sparking?

The 3E133 (or similar) Infra-Red Heater with correct voltage to the circuit board should produce a spark at the spark ignitor rod within a few seconds of having power applied. If it doesn't, one of the following could be the problem: (1. circuit board (ignition controller) is bad. (2. The gap between the spark ignitor rod and the middle rod (ground) is incorrect. It should be between 1/8" & 3/16". (3. There is not a good ground. This could be due to rust or a loose connection at any point between the equipment ground and the spark ignitor rod, including the ignitor mounting screws. (4. The spark ignitor rod or its orange wire is grounded, such as touching metal and thus "short circuiting" rather than allowing the spark ignitor rod to be 1/8" from "ground".
That's all I can think of that would cause NOTHING to happen.