The Most Common Reason Why A Gas Furnace Won't Turn On

Summary by Krater

This video covers how to troubleshoot and fix a furnace that turns on and quickly off due to a faulty flame sensor, detailing a six-step startup cycle and showing how to clean or replace the sensor.

From the video

Answers: How do I troubleshoot a furnace that turns on and then quickly turns off?

• furnace troubleshooting
• furnace startup cycle
• flame sensor cleaning
• flame sensor replacement
• HVAC maintenance

What it concludes

• A common furnace failure where the burner turns on and off is caused by a faulty flame sensor that fails to detect the flame.
• Carbon buildup on the flame sensor rod can be cleaned using steel wool or a dollar bill to restore its function.
• Cleaning or replacing the flame sensor is a simple, low-cost fix that can solve furnace lockout issues without needing expensive parts.