Furnace repair. No heat call. Found manual resettable high limit was tripped, causing the blower to keep running. Very old unit. Usually, when this happens, it’s due to a cracked heat exchanger. I reset the limit and adjusted the gas pressure. The customer is aware of needing a replacement. These are combination units, and we will need to get back to her about pricing. The system keeps popping the limit. Gave the Customer a space heater for the time being. Info tag of existing unit is in pictures!