Abstract: A temperature regulated control arrangement for an elevator controller includes a mounting panel and at least one semiconductor electrical device attached to the mounting panel. The panel is at least partly thermally conductive and is mounted on a housing which defines at least partly a fluid passageway. Couplings connect liquid conduits to the passageway, and the conduits communicate a liquid to and from the passageway. The volume of liquid in the passageway is sufficient to absorb enough heat to keep the semiconductor devices within their operating temperature limits for a period of time even after failure of the liquid circulating system.