Cleaned & checked gas furnace. Inspected heat exchanger & flue venting. cleaned burners & flame sensor. Checked voltage & amp draw of motors. Test capacitor. Check humidifier, checked water flow and drain. Solenoid valve has blockage. Replaced solenoid valve. Customer replaces pads. Blower: 3.8/4.9A . Inducer: 0.11/0.23A. Gas pressure: 1.7/3.5inches water column. Temperature rise: H: 51 . Supply: 133 . Return: 82 .