On my MK7A - and this is just my guess based on observation - Pulse 1 flashes (~1000 flashes per KW) when energy is being used from the grid. Pulse 2 - at least for me - flashes when my solar is generating. So Pulse 1 for household energy use and Pulse 2 for solar generation. Again, not sure if the pulses indicate different things on other meters, or if you don't have solar maybe Pulse 2 does nothing? This is just what i've observed in my particular setup.
By way of illustration - on a sunny day, when I'm not running multiple high-usage appliances (i.e. toaster + kettle + microwave etc.), I'll see no activity on Pulse 1 and Pulse 2 will be blinking rapidly.
When I start using more power, or there is less solar coming in, the Pulse 2 will flash slower. Still no activity on Pulse 1 as (I assume) I am still generating more solar than I am using, so still not pulling from the graid (Pulse 1).
When there's no solar, or I am using more power than solar is generating, I'll see Pulse 2 stop flashing altogether, and Pulse 1 starts flashing (speed of flash depends on how much I'm using.
NB: never see either 'hard on' - I'm guessing you mean it's just a solid red light on, not blinking at all? - which might be something's not right?
