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Hi, jadnashua, The pressure goes to 38psi only when I turn on DHW(domestic hot water), while the heating system is off. The pressure goes from 20psi to 26psi when I turn on heating system.

The pressure goes to 38psi when I turn on DHW(domestic hot water), while the heating system is off. The pressure goes from 20psi to 26psi when I turn on heating system.

Thank you very much. I really appreciate your idea. Could you tell me if I change a new expansion tank, how much pressure I shall precharged. Thanks

Yes, I have one. I thought the expansion tank only to do with my home heating system. I have not used heating system at all during last three months since it is in summer. I only used domestic hot water.

Hi, there, There is a Navien NCB-240E installed in my house one year ago. Recently, in the summer, error code E351 happened once, then I open the auto feed valve to make up some water, the unit works again. But the problem came again in two weeks. I found the pressure drops 1psi everyday, but...