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The RTH8500D Thermostat has built-in compressor protection (minimum-off timer) that prevents the compressor from restarting too early after a shutdown. The minimum-off timer is activated after the compressor turns off. If there is a call during the minimum-off timer, the thermostat shows Wait in the display. When the minimum-off timer expires, Cool On or Heat On appears solidly in the display and the compressor and fan turn on
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