Performed heating maintenance on a 2019 Carrier two stage 96% efficient natural gas furnace **20x25x4 filter needs replaced** Please use Honeywell brand MERV8 filters Other brands don't fit the cabinet perfectly and will allow the system to get dirty Replaced humidifier water panel (part number aprilaire #35) and opened bypass damper Had to clear a blockage on the humidifier water line Humidifier functioning properly and free of water leaks Changed humidifier settings on the thermostat to humidifier only with a call for heat to save water Removed flame sensor and cleaned High fire gas pressure set to 3.2"wc Temperature rise 52⁰ (spec 40-70⁰) Low fire gas pressure set to 1.3" Temperature rise 41⁰ (spec 30-60⁰) Furnace is in good shape and operating within factory specifications at this time