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Steam Boiler short cycles...30 seconds or less

appletaxiappletaxi Member Posts: 2
30 yr old residential one pipe steam boiler system.
Turning on and off constantly.
Some times the burners do not get fully lit before turning off.
A slight gas smell from the burners not fully lighting.



  • Jamie HallJamie Hall Member Posts: 12,724
    Almost certainly a controls problem, probably in the ignitor or flame detector or gas valve. But which one? Unless you are very comfortable troubleshooting, might be a good time to get a qualified gas burner tech. in to take a look? And maybe clean the boiler and adjust everything while he or she is at it?
    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
    The first thing that comes to mind is the flame sensor.
    It is a metal rod that has to be in the pilot flame to keep the gas valve on. Often simple cleaning will fix your problem.

    Can you see the pilot/igniter assembly mounted on the burners?
    A picture of it and also the control module might help.
  • appletaxiappletaxi Member Posts: 2
    Technician found the the Low Water Sensor was gunked up. Drained system and cleaned. Running fine now.
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