You can call Google on +44(0) 808 169 2307. Mine died on Friday and a
replacement arrived Tuesday. The support centre will guide you through
the entire process. You must get a case numbers from them. You need to
be patient as they will ask many quest...
Mine died on Friday, it said no power on the thermostat, spoken to the
installer, basically the heat link is dead. You need to contact Google
for a replacement if it's still under warranty.Gone through the entire
process and Google will post replacem...