A lot happening here and some information may be true but unrelated to your issue. Ie grey tank being full, could it be that your tank was just full or did it come from your water system leak that you’re describing?
The sensor reading err, opn, or 25 indicates there is a loose wire somewhere. When that happened to mine it was just a loose wire near the sensor but it could be anywhere along that wire.
If you turn on the water, are you still leaking? It sounds like it’s a pretty active leak… or is it that it has just been happening for a long time?
Usually if it’s your check valve in your water pump that fails, it will fill up your fresh tank first and then anything else that allows water flow. So it’s weird that you don’t have any water in your fresh tank.
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