danager wrote:
Sounds like there is air in the lines. The pump will try to compress this, not very successfully. I get what you are describing when I de-winterize and need to re-establish the air cushion in the hot water tank.
There are other culprits. There could be a leak, you would have found that after 3 hours of running. Consider too that your pressure switch may need adjustment to could be jammed open because of debris.
Thanks for the help. I have considered that there may be a leak somewhere as well but, I have checked all the lines and connections and can't seem to find anything. If it is an air problem as you said, do you have a suggestion on how to air it out? Should I open a line and just let it go and see what happens or what?