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Why does my boiler have bad surging at start up, but as it goes the surging in minimal

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At start up it is horrible, sometimes triggering the LWO, but as the cycle continues it bobs minimally. What are your thoughts, thank you

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  • KC_Jones
    KC_Jones Member Posts: 5,741
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    Is this a new installation? Even if it’s not was it skimmed when it was installed?
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • Itmejvt
    Itmejvt Member Posts: 4
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    1 year old, it’s was skimmed last year
  • ethicalpaul
    ethicalpaul Member Posts: 5,729
    edited November 2019
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    I would suspect oil on the water or dirty water, or water with too high a ph level (too many additives) or too high a water level, or an overfired boiler or a combination.

    I would guess that at first the boiler is throwing water into the main(s) and after it does that a bit the water level goes down and things settle down.

    Check those items and worst cast you can rule them out.

    Also post pictures that are such that each one shows the boiler area from floor to ceiling, and take shots from several angles. The near boiler piping may be involved.
    NJ Steam Homeowner. See my sight glass boiler videos: https://bit.ly/3sZW1el
  • KC_Jones
    KC_Jones Member Posts: 5,741
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    > @Itmejvt said:
    > 1 year old, it’s was skimmed last year

    How much? It might not have been enough.
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
    ethicalpaul