I took it all to bits today
1- Resin in the water tank
2-Resin in Pump pre filter
3-Riser basket inside DI full of Resin
Emptied tank and flushed out,cleaned all the above and while fitting tap to tank outlet managed to cross thread fitting,so ordered new one next day delivery, hope to get it all back working again tomorrow.
Im hoping the problem was the riser basket was full of resin and unable to rise to the top,allowing resin to flow into the water tank.