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Thread: boiler pressure at 30 PSI

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    DIY Junior Member suelue's Avatar
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    Default boiler pressure at 30 PSI

    Our boiler valve goes over 30 PSI - happened with our old one so we had it replaced. Have this one not even 3 years and doing the same thing. Any idea why the same thing would be happening again? Could the tank be bad in less than 3 years?

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    In the Trades Tom Sawyer's Avatar
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    Bad or unpressurized expansion tank
    Auto fill valve improperly set or bad
    High limit set too high
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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    Moderator & Master Plumber hj's Avatar
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    There are several possibilities, but none that we could diagnose without doing our own tests on the boiler.
    Licensed residential and commercial plumber

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    TROJAN WORLDWIDE SALES RP MACPLUMB 777's Avatar
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    Go to this website for answers http://www.heatinghelp.com/

    MACPLUMB 777

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  5. #5
    DIY Junior Member suelue's Avatar
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    This can be the problem even though it is all new?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    If the expansion tank isn't sized properly or precharged to the needed level, it could allow the pressure to rise more than desired. But, it's more likely that the autofill valve is potentially leaking or incorrectly set. FWIW, an autofill valve can mask system problems, and you may want to just readjust the pressure to design, then (hopefully you have one) shut the water off to the autofill valve. If you have a leak, having it open can mask that to you. Constantly adding fresh water to a boiler is problematic, and you really want to know about it. IF you don't have any leaks, shutting the autofill valve will have no effect on the system operation. If you do have a leak, instead of creeping up, it will gradually drop as water leaks out, eventually tripping the boiler's low-limit safety device interlock.

    If it's something else, it's still a good idea to shut the autofill valve and you'd have eliminated one of the possibilities.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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