Did you leave the pump running overnight?
It sounds like what happened is that the pump was dead headed - it couldn't send the water anywhere because with the solar valve the way you have it I believe there is another valve near the pipe running up the wall to the solar that is shut off. So the pump will get hot which will heat the water, etc. Edit: the shut off is on the return side of the solar. Is there one on the supply line? All I see is a flow meter next to the filter right before it goes up the side of the building. You may just have pressure tested the solar panels...did any water come off the roof?
What's weird is the dirty water coming out of that port. Are you sure the waterfall was not also dribbling when you saw debris coming out of the port? Maybe the valve was not completely closed ... or it leaked due to the hot water?
It sounds like what happened is that the pump was dead headed - it couldn't send the water anywhere because with the solar valve the way you have it I believe there is another valve near the pipe running up the wall to the solar that is shut off. So the pump will get hot which will heat the water, etc. Edit: the shut off is on the return side of the solar. Is there one on the supply line? All I see is a flow meter next to the filter right before it goes up the side of the building. You may just have pressure tested the solar panels...did any water come off the roof?
What's weird is the dirty water coming out of that port. Are you sure the waterfall was not also dribbling when you saw debris coming out of the port? Maybe the valve was not completely closed ... or it leaked due to the hot water?