Assume you mean roll-out switch on a furnace....it is a temperature sensitive safety control intended to limit the temperature in the vestabule or burner area. if it keeps tripping, it's because something is causing the temp to get too high. a dirty filter would be first suspect. it could also be an inoperative blower, a dirty evaporator, or a blocked flue or vent pipe. check all these things out and you will likely find your problem..
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