Solar Roof Leak from Air Vent

[surfcitybill]

Hello to All. My first post. I'll try to be brief but if more details are necessary please let me know.

I have had my pool for over 12 years. Inground, 20' x 40', approx 30,000 gallons. It is heated by roof mounted solar panels. Recently, I started getting some "spillage" coming off the roof out of the air vent which is normally used to allow drainage when the system is turned off. I did not notice any excessive pressure in the filter out of the ordinary. Sometimes this spilling or leaking would occur, sometimes not. It would take @ 30 minutes after the pump was turned on for this to start happening. I changed out the air vent and thought that might have been the problem as it stopped the problem for a few weeks but now it occurs within 5 - 10 minutes of the pump being turned on.

What's frustrating is that this happens even when I have the solar system completely turned off and supposedly by-passed by the diverter valve. I recall once being told that even when the solar is diverted (off) that some water is still sent to the system but I can't understand why enough water or pressure would be on the roof when the system is turned off to cause water to flow from the air vent.

Anyone have any experience with a problem like this? Or perhaps suggest some troubleshooting solutions?

Thanks,
Bill

[generic17]

Bump!
I am having this problem.
I suspect the vent on roof because all the other joints are tight and do not leak.
The vent is ten years old and never replaced.
I have had leaking while panels were off, now it leaks while panels are on.
Yesterday, ran panels for a few hours, turned off panels, left pump on,
was surprised that it seemed like more water started coming off roof after
turning off. Turned pump off, panels continued to leak for many hours.

I have kept the panels in good order by replacing them and sealing them.
Took advantage of panels warrenty and it really helped.

My biggest weak point is no reliable panel contractor to go to for help.
I am willing to pay for time and materials,but these people just do not
return phone calls or show up. They seem to have no interest in repair and maintenance.
Seems like the contractors only care about new installs.

Need help here, losing water when panels are off, losing water when panels are on.