Steve Arnold is president/owner of Arnold’s Service Company Inc., Louisville, Ky., an online HVAC parts supplier. For more information, visit www.arnoldservice.com.
One of the most common furnace problems that I see is when the furnace hot surface ignitor will not glow. The furnace may have a bad ignitor, loose wire connections, open limit switch, open rollout switch, open pressure switch, or bad control board. This is what you might see in the furnace sequence of operation.
