4iE Smart WiFi Thermostat

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My 3iE/4iE thermostat reads “ER1 Out” on the display?


“ER1 Out” error message indicates that the thermostat has not been set up correctly.

An external sensor has been selected but the 2nd sensor has been wired to the thermostat.

Go to the Main Menu and select Settings > Advance settings > Select  Probes > Select External> Select “no function”.