Platinum KC combo code CO2 error

[Sciellie]

When powering on, We are getting a code CO2 and the machine shuts down. I can’t find this anywhere! Anyone have a clue?

 

[Cowboy1955]

When powering on, We are getting a code CO2 and the machine shuts down. I can’t find this anywhere! Anyone have a clue?

Sure it’s not e02?