I have occasionally used a manual pump for relieving engorgement but am about to need to pump more often and would like to use my electric pump. I've never had trouble with the manual pump, but the electric doesn't seem to do anything. My nipple barely moves, much less squirts milk, even on the highest setting.
I use the same shield that I use with the manual (they are both the same brand and parts are interchangeable). I have even started the flow with the manual then switched to electric, with no results.
I checked that the tube is connected on both ends, the portal to the other side is closed, and even had my mechanically-minded husband double-check behind me.
Suggestions on what to try next?