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safety interlock is not being disabled. Older types have a mercury filled bulb flame sensor, newer types have a thermocouple or millivolt sensor. Diagnose and repair the safety shutoff interlock, when the flame heats up the sensor the gas valve should keep the flame lit on its own.
,Hello, Make sure the flame sensor is clean near the burners, The flame sensor is a metal rod that is on the opposite side of the ignitor. To clean the flame sensor you will need some steel wool, turn off power to the furnace and remove the flame sensor and clean it with the steel wool. After cleaning reinstall it and turn power back on to furnace.
I assume that you are referring to a natural gas forced air furnace. If so you just described the symptoms of a dirty flame sensor. Remove the sensor with a 1/4" nutdriver. clean the flame sensor with a small piece of fine grit sandpaper or emery cloth. replace the sensor and turn the furnace back on.
the most common problem is the flame sensor located just behind the fire chamber, about two inches long in a round rubber boot with two wires. you can get one from mr. heater for about 3 bucks. the wires are a different color but all you have to do is splice them to your old wires. it doesn't matter how you connect them.
It seems that your heater is not sensing the flame is lit and is shutting gas supply off. There should be what is called a flame sensor, it is a thin pc. of metal that sticks out into where the flame when lit.
This usually gets charred and dirty, if you unscrew it and clean it with a soft cloth then re-insert it, it will get you by. You should get a new sensor when you have a chance.
Good luck and be sure to disconnect from any power source or turn unit completely off when orking on it.
go to this site www dot desatech dot com. Here you'll find parts to repair your heater. a propane heater uses a millivolt generator to sense the flame. along it's cappilary are two push on spde connectors. these connect to the high limit temperature sensor which is mounted on the flame backplate of your heater. to see if it is the high limit shutting down your heater, jumper across the two spade connectors. if the heater stays on, this is your problem. if the flame still goes out, then the millivolt generator is shot.