Flame monitoring device and flame monitoring program

A non-transitory computer-readable storage medium storing a flame monitoring program for causing a computer to execute:

• an information acquisition step of sequentially acquiring a flame level indicating frequency of discharge of a flame detector caused by a flame of a burner;
• and
• a flame level monitoring step of monitoring the flame level sequentially acquired by the information acquisition step;
• wherein
• in the flame level monitoring step, a sign of a flame failure of the flame is detected by detecting an occurrence of a specific period during which a state in which the flame level is less than a predetermined threshold value continues for a length of time equal to or more than a predetermined first period and less than a second period, and
• the second period is a period having a length of time equal to or less than a period from an occurrence of the flame failure of the flame to the detection of the flame failure in a combustion system that controls the burner when it is assumed that the flame failure occurs.