I am having a problem with the T&P valve opening continuously, on & off. I found the T. stats where bad due to temp settings 140 degrees replaced, the expansion tank full of water replaced also replaced the T&P valve. last thing I will be checking is the water pressure regulating valve. If I open the cold water inlet to the tank open all the way, it opens quicker. what going on ?

  • What is the cold water pressure at the tap? Are you on city water or well water, for that matter? – ThreePhaseEel Mar 5 '19 at 23:50
  • A picture of the system would be helpful. It sounds like the pressure is too high. – Joe Fala Mar 6 '19 at 0:19
  • Check that the expansion tank is inflated with appropriate pressure according to your house water supply – DDS Mar 6 '19 at 8:52

You may have a shorted element that will cause water to over heat which in turn will cause the T&P to open regularly/occasionally.

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