No I do not believe it is your thermocouple, as that only detects heat from the pilot light and permits the gas valve to open and have main flame ignition. I would be looking at thermostat placement, and safety limits built in to the heater. Making sure that the thermostat is not getting a straight on blast of hot air from the heater is my first guess. Try jumping out the thermostat by first removing the thermostat from it's housing and placing a jumper between the red and white wires as they are usually the control for heat. If your heater stays running it is the thermostat. If not you now have to trouble shoot all safety limits one at a time with a volt ohm meter and run continuity tests the limits should read closed except for the fan high limit it should read open until the temperature of the heat exchanger reaches it's set temperature. Remember to power down your unit when trouble shooting please.
Now how do I find the thrmostat on the unit?
Is there a knob for hotter and cooler? How do you turn this heater on? Does this unit just run with out any controls for heat settings? Those questions being asked start at the power switch or where you fed power to the unit and you are looking for limit switches for over heating. They will usually look like buttons with two wires one in one out, these can be checked with a volt ohm meter and should read normally closed. If you run up on one that is open that is the culprit change it out.
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