If all lights (add water, heat, and medium cup size buttons) on your Keurig coffee machine keep flashing, then there might be a problem with the water filter or the needle.[br]
Try Cleaning Water filters first if that doesn't work then clean the needles. Hopefully, it will solve the problem. This article might help you:[br]
[link|https://coffeeabout.com/keurig-lights-blinks/|Why My Keurig Lights blinking|new_window=true]