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I hear a humming/clicking noise from my ecobee3. What could be the cause?

I hear a humming/clicking noise from my ecobee3. What could be the cause?

This happens because the thermostat is not receiving enough voltage. It needs 24V, so if it’s getting less than this you will hear this noise. This could also be a result of a bad C-wire, from it being sliced or damaged, which would cause it from not providing sufficient voltage.

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