snapping in boiler

Discussion in 'Boiler Forum' started by ak bike, Nov 15, 2009.

  1. ak bike

    ak bike New Member

    Nov 15, 2009
    Hi , we just had a new boiler put in ( Carrier). The new system works great with one exception. when boiler temp is down and a zone calls for heat and the boiler temp starts to rise there is a loud snap like a piezo lighter or mouse trap coming from within the boiler. It doesn't seem to be a switch as you can have a hand on the switches and feel nothing . It seems to come within the casting, I don't know if its expansion but there will be LOUD snaps at maybe 10 second or 5 sec intervals . The snapping decreases as the temp gets up to 140 or so then may snap once at 170 as its shutting down . The snaping isn't consistant but seems to be temp related. As the temp starts to rise you can bump the casting with the heal of your hand and cause it to snap then wait a bit before bumping it again to get it to snap . The system is great and the installation looks good. Just wondering if anyone has run into this situation. Thanks
  2. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Jun 22, 2009
    Red Seal Journeyman Plumber & Licensed Gas Fitter
    Penticton, BC
    If you're positive it's the casting then it must be expansion... This is an odd problem though.

    Are you sure it's not the gas valve or something like that? Positive it's the casting?
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