Hi capo .. The ntc I got was exactly the same, it was from another original ariston.
Before I put the ntc that got the measure and was in 18 k. And after I put it in the washing machine the fault followed me, I removed the ntc and now I average 1k.
I heated it with a lighter and now it measures 18k again.
That's why I don't know what the problem might be, maybe the board doesn't recognize it