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Weil McLain Won’t Ignite

kesowul Member Posts: 1
edited January 2019 in Gas Heating
I have a 10ish year ole Weil McLain boiler - model 1107-1 that is giving me issues with igniting. The startup process seems to go well and a spark is initiated, but the boiler fails to light. I’ve included a photo of the unit. The top “flame” light on the control board flashes when attempting to ignite. I have cleaned the boiler and checked/cleaned the igniter rod, but that’s as far as I’ve gotten. Any addition insight would be appreciated!


    HVACNUT Member Posts: 5,259
    Theres obviously 24v to the pilot valve. Is there 24v to the main valve?
    Gas pressure? Lockup and manifold.
  • DZoro
    DZoro Member Posts: 1,048
    Clean the pilot tube/assembly.
  • JohnNY
    JohnNY Member Posts: 3,206
    Practically speaking: spark + gas = ignition.
    If you see the spark and know it's there, check the gas.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Plumbing in NYC or in NJ.
    Take his class.
  • unclejohn
    unclejohn Member Posts: 1,833
    Is that the pilot only burning in the photo ? If so did you try cleaning the flame sensor as well as the igniter rod. Also check your ground wire make sure it,s tight.
    JUGHNE Member Posts: 10,798
    Could be low gas pressure from the utility....might be OK now??