Condensing furnace short cycling
Do you have a single return grill near the center of the house or do you have numerous return grills in many rooms? If it is a single return grill, check to see if it has a filter that needs to be changed. Also it is possible that the blower fan's vanes have accumulated enough dirt and dust to reduce their ability to move enough air through the duct system but would allow the furnace to operate properly when the blower door is removed.