This may be helpful to those who encountered the same problem I had when my gen 3 wall connector was installed by an electrician. After the initial installation, I had an issue where my wall connector displayed a solid blue light and would not charge the car despite following the Tesla trouble shooting guide online (resetting the device, turning off scheduled charging etc). When I had the electrician come back to check on it, he removed the cover to check the wire connections and then when he replaced the cover the light turned solid green as it should be but then as he was screwing the cover in place with a power tool it turned blue again until he loosened the screws. So he hand tightened the screws and now the wall connector is working fine. Weird. I’m guessing if the cover is pushing down on something inside, it somehow is affecting how the wall connector functions.