Complete 2 Systems 2 AHS Heating Maintenances. US Lennox 90% Gas Furnace: cycled system. Checked tstat and air filter. Checked Blower Motor amp draw and run cap. Checked electrical connections. No CO detected. Burners are clean. Cleaned Flame sensor. Checked amparage on draft motor. All safety switches are on great condition. System is running great at this time. DS Lennox 90% Gas Furnace: cycled system. Checked tstat and air filter. Checked Blower Motor amp draw and run cap. Checked electrical connections. No CO detected. Burners are clean. Cleaned Flame sensor. Checked amparage on draft motor. All safety switches are on great condition. System is running great at this time.