Don't throw the one that isn't working away yet. I am investigating some Smart Effectors that passed initial testing but subsequently give 6 flashes.
EDIT: I have re-tested those. All of them work properly, except that some of them flash 6 times once or twice immediately after power up.
Note, it is normal to get 6 or 7 flashes once or twice while the circuitry stabilises. I will add this to the instructions. The version 1 effectors didn't do the same self-test, but many of them also needed a few additional seconds after power up before they responded to nozzle contact.