If this is a gas furnace it sounds like you have a polarity issue (line and neutral swapped) or you do not have a good ground to the unit. The newer units 1998 on up are polarity sensitive and require a good ground for its controls and safeties for continuous operation. Checking these things should resolve your problem. After it tries to fire twice without the flame sensor sending back a flame sensed flame signal it will lock itself out until the call for Heat is not present which will reset the control board.
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