Technician responded to a no heat on a 2009 tempstar furnace. Upon arrival the technician found code 3 pressure switch open code on control board. Technician reset unit and tried to cycle. When the unicycle to technician heard a buzz/grind from the combustion exhaust system. Technician presented options hm8a-e. Customer chose option A. Technician completed repair and cycled unit successfully. No issues at time of departure.