Sensi Touch 2 Smart Thermostat | INSTALLATION GUIDE 9
Blank or flashing display
If you installed a Sensi Touch 2 smart thermostat, but the touchscreen is still blank or only
flashes after completing all the steps in the Sensi app, then the thermostat is most likely not
receiving enough power from your system to turn on or stay on continuously.
Sensi Touch 2 requires a c-wire to power the thermostat.
I DON’T HAVE A WIRE IN THE “C” TERMINAL.
Sensi requires a c-wire. If you don’t have a wire in the “C” terminal, check out our
c-wire videos for DIY installation at sensi.emerson.com/en-us/c-wire.
If you are installing Sensi to a heat-only system, you may be able to install an external transformer. Learn
more about that option by searching “external transformer” on our support site at sensihelp.com.
I HAVE A WIRE IN THE “C” TERMINAL.
Did you DIY this c-wire connection? If so, make sure that this wire is connected
to “C” terminal at the thermostat and at your system.
1. Go down to your indoor HVAC unit furnace/air handler, reveal your system’s control board and trace the c-wire
at the thermostat to ensure that it is securely connected to the “C” terminal at the system control board. If
you haven’t already, it may help to watch one of the c-wire videos to see how to access the control board.
2. Gently tug the c-wire at the system control board to ensure that it is screwed into the terminal securely.
3. Gently tug all the wires at the thermostat to ensure that they are secure in the terminal block on the sub-base.
4. Do you have a voltmeter? Set your voltmeter to AC and measure the voltage between
RH (or RC) and C at the thermostat to ensure that you have between 20–30VAC at the
thermostat. If you have less than 20VAC, the thermostat will not turn on.
5. Are your breakers on? You turned your power off for installation. Make sure the power is
turned on. You may want to try resetting them if they’re already turned on.
TROUBLESHOOTING
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