To control heating operation safely before an operation panel is damaged and burned when an air fan is interrupted in heating or when a closure accident has occurred on a warm air discharge outlet.

Among the atta positions of dispersedly provided a plurality of operation panel temperature detection devices at a plurality of positions of an operation panel 7 provided on an upper surface section of a warm air heating machine body in a region of a wiring printed circuit on the back of the operation panel 7 when there occurs a trouble of an air fan 3 being interrupted in heating operation and occurs a closure accident of a warm air discharge outlet 6 to make exhaustion of hot air difficult resulting in production of abnormal overheating, an operation panel temperature detection device 13 is fixed and wired during passage through a solder bath together with other parts at positions of mount portions of the operation panel temperature detection devices in which mount portions temperature rise occurs eariest for every machine kind. Thereby, there can be detected rapidly and accurately temperature of the back of the operation panel 7 where an abnormal temperature rise occurs as a result of being exposed to radiation from a heating portion where the abnormal overheating occurs. The safety of the warm air heating machine is further improved.