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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!