THE FURNACE ATTEMPTS TO START WHEN THE THERMOSTAT TELLS IT TO BUT IT MAKES A SOUND AS IF IT WILL START THEN SHUTS OFF .IT ONLY STARTS WHEN I MANUALLY UP THE TEMPERATURE BY A COUPLE DEGREES.I EXPLAINED THIS TO A PROFESSIONAL SERVICE TECH WHO SAID NOTHING WAS WRONG WITH THE FURNACE.HE SERVICED IT BUT IT IS STILL DOING THE SAME THING.WILL THIS CAUSE THE MOTOR TO BURN OUT AND OR OTHER PROBLEMS?