Hi guys, i have a problem with my autopilot digital 220. i keep getting the message check flow, i did a few things: first i checked all the skimmer basket, cleaned the filter, the manifold screen,etc. im getting great pressure with no bubbles. i read where to check the capacitors and sure three had black stuff coming out the top, i replaced them, also the fans dont come on, i replace them but its still not coming on, any help will greatly be appreciated. I also tested the connector on the main unit for the tri sensor and get no charge or continuity. so what can go bad to cause this. thanks