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 displays the Parameter and rld value on the screen, allowing access to advanced configuration options. (Page 34)
From the official Honeywell Thermostat Battery manual, page 34
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