What is the equipment alarm symbol and when does it appear on the e7w display?
The equipment alarm icon (symbol 11) appears on the e7w display when the thermostat has lost communication with its HVAC partner device. This icon is only displayed in Service Mode to avoid guest complaints and indicates a communication failure between the e7w and its configured HVAC controller. (Page 25)
From the official Honeywell Thermostat Battery manual, page 25
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