Cleaned & checked gas furnace. Inspected heat exchanger & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Test capacitor. Blower: 4.0A . Inducer: 0.69A . Gas pressure: 3.4inches water column. Temperature rise: 48 . Supply: 79 . Return: 127 . Humidifier not working. I found humidifier supply valve clogged. I replaced with ball valve. Clean humidifier, replace pad, checked water flow and drain. Paid by Visa.