3iE Energy-Monitoring Thermostat

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What does it mean if my thermostat screen is black and will not turn on?

If your thermostat has no display and will not turn on when power button is pushed, the thermostat could be wired incorrectly. Please have your electrician make sure the thermostat is wired correctly with the same voltage that corresponds to your heating system. If problem persists, please contact Warmup for further assistance. 

Wiring instructions can be found here.