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steam keeps goin on and off

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PFPH
PFPH Member Posts: 1
in THE MAIN WALL
I'm trying to fix a steam boiler I got a no heat call and I replaced the pigtail then the tsat.the heat keeps going on and off **** help please.

Comments

  • furnacefigher15
    furnacefigher15 Member Posts: 514
    What is controlling burner?

    What is shutting of the burner?

    Pressure, Thermostat, Timer, Lwco?



    How much does it cycle? Do you see it happen?



    A lot of things can turn the boiler off.
  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
    off and on

    try putting a jumper on the terminals of the control, to simulate a call for heat, and see what part may be shutting down the burner. if it runs continuously, then the thermostat could be set incorrectly for steam.

    if it is shutting off on pressure, then check the main vents.--nbc
  • Jamie Hall
    Jamie Hall Member Posts: 26,838
    keep in mind, too,

    that you may have more than one pressure control and more than one LWCO.  You have to find out, as furnacefighter15 says, what is turning the burner off -- and then you have to find out why.



    The thermostat, IMHO, is the least likely culprit.... at least, if the cycles are close together. 
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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