How do I enter Service Mode on the e7w thermostat?
To enter Service Mode, press and hold the FC key for 5 seconds, then press and release the MODE button, press and release the FAN button, and finally release the FC key. This will display the Parameter and rId value on the screen, allowing you to access advanced configuration options. (Page 34)
From the official Honeywell Battery Thermostat e7w manual, page 34
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