dL = Display Light. Change that setting to Off. To get into the Configuration Menu have the thermostat must be in Heat or A/C, Press and hold Menu for five seconds, then press menu button to step thru the settings.Click to see full answer. Besides, what does DL mean on a thermostat?Single Point On/Off Temperature ControlsAlso, how do I unlock my Emerson thermostat? To unlock the Emerson thermostat, press the MENU key on the thermostat. From the settings menu displayed on the screen, use the navigation keys to select the thermostat lock option. You will see the UNLOCK option in the lower right side of the display. Subsequently, one may also ask, how do I reset my Emerson thermostat? To reset, the System Switch must be in Cool or Heat. Simultaneously press and buttons for approximately 10 seconds until the display goes blank. If the thermostat has power, has been reset and still does not function correctly contact your heating/cooling service person or place of purchase.How do I reset my thermostat? Here are the steps you need to take to reset your AC thermostat. Shut Down Your AC at the Thermostat. The first step in resetting your AC thermostat is to turn it off at the AC unit. Find Your Circuit Breaker Box. Reset the Circuit Breaker for Your AC Unit. Wait 30 Seconds. Turn the AC Thermostat Back On.

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