The Mystery of the “Stuck Vent Damper” — Weil-McLain Boiler Repair скачать в хорошем качестве

The Mystery of the “Stuck Vent Damper” — Weil-McLain Boiler Repair

When a boiler won’t fire, every step of the diagnostic process matters. In this service call, we were called out to troubleshoot a Weil-McLain CGa gas boiler reporting that the vent damper was closed even though there was a call for heat. We began by verifying the two safeties in line between the circuit board and the damper motor—both tested closed, so they weren’t the issue. We then removed the damper motor module and tested continuity across the winding, recording OL (open line). When we tried to manually rotate the damper shaft, there was clear resistance, indicating something was physically jammed. After removing the sheet metal elbow on the vent, we found the true culprit—a bird trapped inside the damper motor fan blade. Sadly, the bird had flown into the flue seeking warmth and got caught when the damper closed. Once the obstruction was removed, the damper rotated freely, the safety circuit was restored, and the boiler fired up perfectly. 🔧 Key Takeaways: • Always verify safeties before assuming motor failure. • Check for mechanical obstructions when resistance is present. • Ensure proper vent terminations and bird screens to prevent future incidents. 💡 Equipment: Weil-McLain CGa Boiler, Field Controls GVD-6 Vent Damper Subscribe for more real-world HVAC troubleshooting and field diagnostics — from no-heat calls to complex control failures. #HVAC #BoilerRepair #WeilMcLain #FieldControls #VentDamper #NelsonsHVAC #HVACTroubleshooting #RealWorldHVAC