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You should also read the documentation for your own answers. Download documentation for this product here.
Rvl 3120 doesn’t power on.
Please read the solution at: https://www.honeywellhome.com/us/en/support/why-is-my-thermostat-screen-not-powering-up/
Why do my screenshot go blank
what is a e2 code for? How do I fix this?
RLV3120a1005 model number
The thermostat will display error code E02 if the password to the home router was entered incorrectly. The thermostat will automatically progress to the WiFi Set Up screen after 30 seconds.