Furnace clean and tune. Cycled system. Checked heat exchanger, ok. Checked and cleaned burners and flame sensor. Checked igniter, ok. Checked and adjusted gas pressures to maximize efficiency. Checked for CO in airstream, none found at this time. Normal levels of CO and XS air found in exhaust. System is operating normal at this time. Instructed customer about alerts from Honeywell of signal drops from WIFI thermostat. He will contact Honeywell if issues continue. Office gave advice to disconnect everything and reconnect. He will follow that advice. Job complete.