Hi Add-A-Stat fans:
We have had a return stating it did not power on. We tested the Add-A-Stat here and it powered on perfectly. You may want to keep in mind, the Add-A-Stat has to get cold enough inside the device in order to power on. If where you are "storing" the Add-A-Stat is not 35 degrees or colder, please wait for the temperature to change down inside the device - this could take 20 to 30 minutes