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Hello, it could be shutting down on it's high limit switch due to a dirty air filter, dirty blower wheel, weak blower motor. Usually this would cause the furnace to shut down before it reaches the desired temp.
Pat, look for any way to add a few drops of 3-in-1 electric motor oil to the shaft ends. You may find a few small plastic removable plugs where you can drop a few drops into. Get the numbers off the oval shaped capacitor and replace it as soon as possible. Inspect all wires and sand all contacts one at a time to make sure wires go back on original spades. If it continues, you may need to replace the fan relay. Good luck to you!
need to bleed air out of filter at oil tank crack open the screw on top it will bleed out air wait until oil starts to run out then tighten back and bleed at heater on right side lever inside hole push and let off slow 4-5 times and restart
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.
Rmove the two screws holding the blower in place and slide it out. With the power off, rotate the wheel and inspect for debris or an impingement. If everything turns easy, you have a bad motor or start capacitor. If you have rubbing, adjust the wheel. If the motor will not turn, replace it.