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Are you saying the burner fires up then the control locks out while the burner is firing? if so are you sure the burner is firing?
What gets hot? The burner firing is unmistakeable. You'll hear it rumble and see light in the chamber
It's safe you just have to crack it enough to see any light. If the exhaust is getting hot then it's firing
If you have to hit th reset to get it to fire up AND it's locking out while the burner is firing then you either have a bad or dirty cad cell, the electric eye that sees the flame or a bad cad cell socket or a bad control.
Turn the power off, then release the screw on the front of the ignition transformer and swing it back on it's hinge. The check to see if the cad cell glass is clean. See attached pic
Do you have more questions?
Did you have to hit the reset button to restart the burner?