I recently bought a home with a pool. It has a solar system which is great. Everything seems to be working fine and the pool water is at 80 degrees. Over the past few days something has changed.
With the main pump running, all is good, When the booster pump (PB4) tuns on to drive the pool cleaner air bubbles come out the return lines, a lot. The BP4 does not sound like it is getting fully primed.
When I shut down the booster pump the air bubbles are purged from the system and all is well again.
There are no leaks, I've opend and cleaned the U joints, inline filter basket (o-ring clean). Pressure at the filter is at 15psi and has been the same since I switched in the solar 2 moths ago. No air seen in any of the clear valves, that is until the Booster pump is turned on. lots of air bubbles seen in the clear fitting on the return line from the roof.
What could have gone wrong?
Any input is appreciated.