What does the low battery alarm on the e7w display mean?
The low battery alarm icon will be displayed on the e7w LCD when the batteries need to be replaced. This icon appears only on battery-powered thermostat models. When you see this warning, you should replace all four AA alkaline batteries promptly to ensure continued operation of the thermostat.
From the official Honeywell e7w Smart Thermostat manual, page 25
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