AO Smith Tankless Water Heater No Hot Water | Error Code 111 Flame Failure Diagnosis & Fix

When your AO Smith tankless water heater flashes Error 111, that means flame failure — and no hot water. In this real-life uncut service call, Mikey Pipes from Pipe Doctor Home Services diagnoses and repairs a customer’s AO Smith tankless system with no ignition, no flame signal, and years of neglected maintenance. Watch as Mikey walks you through each step: inspecting the install, explaining why annual descaling is critical, checking gas pressure, testing voltage to the ignition transformer, and uncovering lint buildup that led to ignition failure. If your AO Smith tankless throws a 111 code, this video shows what to look for — and how to get your hot water back FAST. 📞 Need a licensed pro in the NYC or Long Island area? Call Pipe Doctor Home Services, Inc. at 516-348-6300 or visit www.pipedoc.net 🕒 Chapters 00:00 – Intro: No hot water complaint 00:32 – Explaining AO Smith Error 111 (Flame Failure) 01:20 – Installation mistakes spotted immediately 02:15 – Tankless water heater basics 03:10 – Why descaling is essential every year 04:00 – Condensate and venting issues explained 05:05 – Opening the unit for inspection 06:10 – Voltage and ignition transformer testing 07:30 – Gas valve and pressure verification 08:40 – Reassembly and system reboot 09:45 – Final test: Ignition success & closing advice 10:25 – Outro + Mikey’s final thoughts 🧰 Hashtags #MikeyPipes #TanklessWaterHeater #AOSmith 📦 LIMITED EDITION 2025 Mikey Pipes Poster — ONLY $42.50 delivered! Includes 5 stickers, pen, card, and magnet. 💯 10% of all proceeds go to Mikey Pipes Philanthropy, helping provide free plumbing and HVAC services to those in need. 💵 Payment Options: PayPal: [email protected] Venmo: @PipeDoctor CashApp: $mikeypipesny Zelle: [email protected]