How do I enable LEM (Limited Energy Management) mode?
Press and hold the MODE button, press and release the FAN button, press and release the UP arrow button, then release the MODE button. The display will show '- - -' followed by 'LE.n' indicating the command to enable LEM mode for 72 hours was sent to the HVAC partner. (Page 35)
From the official Honeywell Wireless Thermostat manual, page 35
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