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 action will display the Parameter and 'rId' value on the screen, allowing access to all advanced configuration options. (Page 34)
From the official Honeywell e7w Room Thermostat manual, page 34
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