We do not currently support IPv6. If the demand for IPv6 increases we will implement it in our products, however at the moment it is not necessary.
Check the power supply to ensure the thermostat is getting the proper voltage (about 24 volts). The red wire from the backplate and the red wire from the thermostat cable must both be in the R terminal. The black wire from the backplate and the common (color varies) wire from the thermostat cable must both be in the 24V(c) terminal.