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Temperature is the main reason affecting the drying effect. Before production, enterprises need to thoroughly inspect the hot air circulating oven to eliminate the harmful factors. Before starting the hot air circulation oven, first turn the knob of the temperature protection switch clockwise to the limited position, and then start the oven according to the steps specified in the manual; Otherwise, it may give an alarm and cut off the power supply when starting up. At this time, it is necessary to turn off the power supply and adjust the temperature protection switch before starting up.