The machine came with a property we are refurbing and had clearly been leaking for some time.
Once removed the area behind was saturated, however due to the floor being tiled up to the plinth and the floor behind being lower, there was no water obvious in the room. It's a pretty poor diy job, kitchen spurred off ring. So I would not be surprised if the machine had also been repaired poorly.
Nothing wrong with diy, as long as it is done correctly. Thank you for the advice. I will investigate and see what is needed.