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Remove panel in front of burners and look for a label on inside(usually right hand side) and give me the model on the furnace.
Then look on control board in blower compartment and see if we have a blinking light to indicate what has failed.If so, tell me the flash pattern of the light.
Lets do this, Using a jumper or a pair of needle nose pliers, jump R to W on furnace board and see if furnace will come on. (Keep in mind door switch will have to be held in to have power to furnace while doing this.