First, inducer fan starts, then burners light and run for about a minute, then the burners cut off, almost always at the moment the blower fan starts. Sometimes the burners will cut off a moment or two before the blower fan starts and sometimes the burners will continue after the blower fan starts but not usually for very long. On a few occasions the burners and blower fan ran simultaneously for some time but that was the exception. The cycle repeats almost continuously.