Register your Ooni product here.
You can find your serial number on the rear leg of your oven or on the side of your Gas Burner. It is a mixture of letters and numbers and it will be at least 10 characters. It will be on a sticker that looks like this:
The serial number can also be found on the box:
Ooni Fyra, Ooni Karu, Ooni Koda and Ooni Koda 16's serial number will be PXXXXX-XX-XXXXX
Ooni Pro's serial number will be PXXXXX-XX-XXXXX OR PRAXX-XXXXX
Ooni 3's serial number will be PXXXXX-XX-XXXXX OR 3AXXX-XXXXX
Ooni Gas Burner or Ooni Pro Gas Burner's serial number will be PXXXXX-XX-XXXXX:
Ooni Karu 12 and Ooni Karu 16's Gas Burner serial numbers can be found on the metal safety certification tags found inside your Gas Burner box. The tags will look this: