Life estimating method for heater wire, heating apparatus, storage medium, and life estimating system for heater wire

摘要

A method of estimating the life of a heater wire, including the steps of: detecting a maximum value of electric power supplied to the heater wire during a temperature rising period during which a temperature is elevated to a preset heating temperature, obtaining an index indicative of the amplitude of the electric power, and giving a notice that the heater wire is approaching the end of its life when the electric power and the index indicative of the of amplitude of the electric power exceed threshold values respectively provided thereto.