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help with a hydrotherm AM series pulse boiler

oc732 Member Posts: 1
i have a HydroTherm AM series 100 pulse boiler. Problem is i have to block the air intake to a fraction to keep the boiler running. gas pressure was checked and is good. boiler was installed 2000 and a tune-up was done.  any ideas why the boiler will not run on full air intake? thank you


  • HDE
    HDE Member Posts: 225
    A few items

    A fan switch- Fan prove, blocked inlet or comb.

    A heating professional can diagnose which one
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