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If furnace is turning on and off, there may be a control board in blower compartment with a light that flashes a certain number of blinks to tell us where to start .Can you check this?
Let me know and we will go from here. Here is the flash code chart. The number of blinks between pausing will let us know where to start.
Lets start by looking in front of burners for a flam senser rod and clean it.
Thanks for allowing me to work with you.Just let me know if you need further .I am happy to guide you.