Spark But No Flame? Weil McLain Steam Boiler Ignition Failure Explained

Astoria, Queens service call during a snowstorm — and this Weil McLain gas steam boiler refuses to light.The spark is there.Gas is present.But the intermittent pilot will NOT ignite consistently.In this uncut, real-world heating service call, Mikey Pipes of Pipe Doctor Home Services diagnoses and repairs a Weil McLain steam boiler with intermittent electronic ignition failure.The culprit?A failing pilot burner assembly.We replaced it with a Honeywell/Resideo Q3451U universal intermittent pilot burner — and the new pilot lights INSTANTLY.🔥 Immediate ignition.🔥 Strong flame signal.🔥 Boiler up and running.This video is for service technicians who want to sharpen their diagnostic skills and homeowners who want to understand what actually causes ignition failures on gas steam boilers.We also point out installation issues on a fairly new AO Smith water heater — including:• No drip leg• No screws in vent piping• Code concernsThis is real field work in Long Island / NYC conditions. No fluff. No edits. Just diagnostics.📍 SERVING LONG ISLAND, QUEENS & NYCPipe Doctor Home Services, Inc.📞 516-348-6300🌐 https://pipedoc.netLicensed & Insured Heating & Plumbing Experts🎯 TECHNICIANS — Pay Attention:If the spark is present but ignition is inconsistent:• Check pilot positioning• Inspect grounding• Verify flame carryover• Consider replacing pilot assemblyThe new pilot burner worked perfectly.🚨 HVAC DEALERS:Want to become an ACiQ dealer or start your own private label brand?👉 https://aciq.com/mikeypipesYou owe it to yourself and your customers to understand inverter technology and high-efficiency heat pump systems.🎉 MEET & GREET – DAYTON, OHIO📍 March 9th – Troll Pub at the Wheelhouse🎂 March 10th – Birthday Bash LIVE from ACiQ HQ🛒 LIMITED EDITION 2025 MIKEY PIPES POSTER – $42.50 DELIVEREDIncludes stickers, magnet, pen & card100% of proceeds go to charityPayPal: [email protected]: [email protected]: @PipeDoctorCashApp: $mikeypipesny👍 If you’re a technician — subscribe.👍 If you’re a homeowner — call a professional.👍 If you respect real diagnostics — share this video.⏱ CHAPTERS0:00 Astoria Snowstorm Service Call1:20 Boiler Won’t Ignite2:45 Checking Thermostat & 24V4:10 Pilot Spark But No Flame5:40 Removing Burners & Inspection7:05 Installing Honeywell Q3451U8:40 Immediate Ignition Success9:30 AO Smith Water Heater Code Issues10:00 ACiQ Birthday Bash Announcement#️⃣ HASHTAGS#SteamBoilerRepair #WeilMcLain #HVACTechnician