Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit

ultra 155 cycles on and off repetitively

BrotherhrBrotherhr Member Posts: 1
My boiler sounds like it is turning on and off over and over all night sometimes. It makes heat though.


  • Jamie HallJamie Hall Member Posts: 12,725
    Most likely a control problem -- or a wildly oversized boiler with no buffering. But we need a lot more detail on the system -- system size, boiler size, piping, controls...
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • JUGHNEJUGHNE Member Posts: 6,797
    When was it opened up and serviced last?
    Failing flame sensor has those symptoms.
Sign In or Register to comment.


It looks like you're new here. If you want to get involved, click one of these buttons!