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sounds like its not venting properly...it likely is shutting off on a "Spill switch" or "Vent safety switch"....check the vent/chimney first off.....also the pilot could be dirty..,..a lazy pilot tends to blow out easily....pilot should be blue and sharp,,,big enough to fully envelope the thermocouple
A polit generator produces about 750 MV without a load. Under load it will drop to about 200-250 MV. If the system is working don't worry about it. If the system is not working replace the pilot generator and retest. Pilot generators usually go bad slowly.
If you have an ML300HGA, it is a manual-control heater, which means you turn it on and you turn it off. No thermostat. It does not have an AUTO setting.
Likewise, the thermostat-controlled models do not have a Manual mode. If you have the ML300TBA, it has a thermostat and will turn itself on/off in order to maintain a room temperature.
On manual models, the numbers (if any) on the dial are heat output selections. Set the control to the highest heat setting and that's what it does until you turn it off.
On automatic thermostat models, the numbers on the dial are temperature selections. Set the control to the highest heat setting and the heater will continue running until it is 85-90 degrees, then shut off. Set it around 2 and it will maintain a temp of around 70 degrees.
All Procom heaters are either automatic (thermostat-controlled) or Manual. None are both.
As a licensed plumber I will recommend now that you don't touch the heater. Gas is dangerous and leaks aren't easily found.
Everytime a gas heater is serviced the tradesman needs to do a gas check to see if all is working well. There are too many things that can go wrong, from a small gas leak to burnt gas leaking, all of which are lethal.
I can tell you how to fix it, but I won't, because it is too dangerous.
Getting a repair man will cost you, but not getting one may cost you your health or your life.