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ruud gas furnace board wont power up
i had a ruud gas furnace where power light wont come on at the mother board. i replaced stepdown transformer as stated in guide. worked 1 day and went off again. i was getting 120 volts out of board going to primary side of transformer.but i put another transformer on and still wouldnt make 24 volts going out to feed board. could there be a bad board or nuetrul problem in board? power good into primary of board also. i am almost thinking maybe there is a electrical problem going to furnace because after awhile it just started working properly again out of nowhere. i even put the hot into the power wire from the switch directly to the hot side of the transformer and left nuetral hooked up to the board and recorded 120 volts and wouldnt power up and after shutting off power playing with this thing for a long time it started up again! i dont know what to d. should i replace the board or have the circuit looked at by a electrician first where this is so intermittent.it ran many cycles no trouble but i know its not solved. i am atech and i cant put my hands on this and i dont want to replace the board unless i am sure. any help please it is a ruud model ugra-09ezajs serial eh5d707f390119502
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