Complaint of unable to set the temperature on the thermostat Stat was running a schedule and adjusting at scheduled times Removed the schedule option Performed heating maintenance Tore down and cleaned both electronic air cleaners Cleaned flame sensor Blew out Condensate trap Vacuumed intake screen to the burner box Vacuumed inside burner box Checked for water leaks No stored fault codes for the system Run tested system Furnace operating normally at this time