Newbie with solar panel question/problem

[Vinny's pool]

Thanks Mark.
The Delta was about 8 when the panels where put in.

[mas985]

8 PSI sounds about right so you definitely has some blockage now. I don't think there is an easy solution to unblock them other than take them apart and clean the headers out. Unless you feel up to it, your installers are probably your best bet.

[tphaggerty]

Most solar systems have bypass valves that leak (they are designed that way). I hate to ask, but are you SURE that these valves are fully open? If they were closed, they would still allow a little water to flow into the solar, but would create a huge pressue delta.

Or, is your 3-way actuator valve possibly getting stuck halfway open (sending only a little water through the solar but creating one heck of a bottle neck in your system)?

[Vinny's pool]

The valve turns all the way to open. Could be that something is not working properly insde?
Could DE block the panels? Can DE get passed the filter?
I appreciate all your help.

[tphaggerty]

OK, so your 3 way is open all the way. But there are ALMOST always cutout valves on the solar, there will be one on the pressure side and one on the return side. You need to check those. They will most likely be at the pool machinery, but I have seen pictures where the valves are on the piping going up the house. Most of the time these are left open when you winterize, but they could have been shut.

Come to think of it, you may actually have 2 sets of cutoffs, one set near the pump and one on the house piping.

Anyway, THOSE valves need to be open. If those valves are open, then you probably have a pipe blockage. I would think if you pump had given it up, you wouldn't have the steep pressure gain.

Take a picture of your solar piping/valves (include the 3 way and a good area around it) and attach it so we can get a look.