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Weil McLain Won’t Ignite

kesowulkesowul 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!


  • HVACNUTHVACNUT Member Posts: 3,263
    Theres obviously 24v to the pilot valve. Is there 24v to the main valve?
    Gas pressure? Lockup and manifold.
  • DZoroDZoro Member Posts: 1,035
    Clean the pilot tube/assembly.
  • JohnNYJohnNY Member Posts: 2,432
    Practically speaking: spark + gas = ignition.
    If you see the spark and know it's there, check the gas.
    For installations, troubleshooting, and private consulting services, find John "JohnNY" Cataneo here at :
    "72°F Mechanical, LLC"
    Or email John at [email protected]
    John is the Boilers and Hydronic Heating Systems Course Instructor at NYC's Mechanics Institute, a professional Master Plumber, licensed by The Department of Buildings of The City of New York, and works extensively in NYC while consulting for clients in and out of state.
    John also oversees mechanical installations and maintenance for metro-area clients with his family's company, Gateway Plumbing and Heating along with his brother/business partner.
  • unclejohnunclejohn Member Posts: 1,522
    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.
  • JUGHNEJUGHNE Member Posts: 6,783
    Could be low gas pressure from the utility....might be OK now??
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