Miller
Flame Disturbance or Grounding Issue
Furnace starts normally but shuts off when the blower comes on.
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Loose ground connection, Blower-induced negative pressure in burner area, Cracked heat exchanger, Poor combustion air supply
How to Fix / Troubleshooting
Safety: This symptom can indicate a cracked heat exchanger or unsafe combustion. Turn off gas and power and consider professional inspection.
- Check ground connections: Tighten all ground screws on the control board, burner rack, and furnace chassis.
- Inspect burner compartment seal: Ensure burner access panel and gaskets are intact to prevent blower air from disturbing the flame.
- Verify combustion air: Make sure the furnace has adequate combustion air openings and that they are not blocked.
- Professional heat exchanger check: Have a licensed technician inspect the heat exchanger for cracks or leaks and perform combustion analysis.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Heat Exchanger
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements