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Boiler mystery- Crown hydronic boiler

So...I hear something running from the boiler the middle of the night, when it's very quiet. It sounds as if water is running into the boiler & it continues for 20-30 seconds, then stops. A minute goes by & it starts all over. No water leaks anywhere. Not sure what is making this noise but something from the boiler is since it disappears after I shut the boiler off.


  • DZoro
    DZoro Member Posts: 1,048
    Sounds like you are low on water. What is the pressure on the boiler?
  • pasquinnal
    pasquinnal Member Posts: 2
    I'll try & find out later as I'm not at home currently. Thanks!
  • Steamhead
    Steamhead Member Posts: 16,894
    Is this a steam or hot-water system?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • HomerJSmith
    HomerJSmith Member Posts: 2,468
    Possibly air in the system.
    HVACNUT Member Posts: 5,863
    Circ exercising or freeze protection?