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ultra 155 cycles on and off repetitively

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


  • Jamie HallJamie Hall Posts: 11,073Member
    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...

    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 Posts: 5,998Member
    When was it opened up and serviced last?
    Failing flame sensor has those symptoms.
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