High Temperature Warning Sticker provides a qualitative monitoring of the temperature inside of electrical and electronic control panels. High temperature inside a control panel can be damaging to internal equipment and lead to unplanned shutdown of factory operations. The label provides for an effective warning with a color change indicator to ORANGE and a danger warning with a color change indicator to RED. Color change is reversible so when the temperature problem is corrected, the label can continue to be used indefinitely. While it is a qualitative measurement only, it provides an ideal cautionary monitoring of possible temperature problems within a control panel.