Gaggenau ED220/221 error code F30 - Gaggenau EB290 Electric Single Oven

SOURCE: we have an Gaggenau EB 290 oven and the error code

F23-relay electronics not selecting. There is either a fault with the pcb or a loss of continuity within the ribbon cable. Unfortunately, I think you are going to need an expert to look at this to confirm.
Sorry I cannot be of more assistance but some faults do require a physical check from a professional and cannot always be sorted out from a distance.
All the best.