Water/vinegar will not enter unless the machine is plugged in and set to fill. The fill valve is closed. Otherwise it would fill continuously and run over.
Thanks. I will try putting the cleaned screens back in.
This fill valve is probably not shot. It was working. The valve is a $10 to 20 part. that is easily replaced if I can get the back off the machine. Screws and clips.
The cold screen was really dirty and the cold faucet was about to burst from the pressure even on low low. It was not doing that before (ie progressively getting worse - maybe screen getting more clogged).
Thanks.