Plumbing Questions? Ask a Plumbing Expert.
Hello, my name is ***** ***** I will do my best to assist you with your problem.
Can you tell me how old the unit is?
However, just off the top of my head you may want to check the auto fill or makeup water valve and the expansion tank. I had one of these last week the expansion tank was ruptured and the system would not maintain working pressure. I believe that model is good to run between 10 and 30 psi. The pressure relief valve should lose water above 30 psi.