Gas Furnace
Re: Low Flame Signal
A gas furnace lights and burns properly, but the flame signal is low.
► This condition will often cause periodic "flame loss" failures.
How It Works:
- The ignition control board sends-out a small voltage signal over the flame sensor wire.
- The resistance between the flame sensor rod, through the flame, to the grounded burner generates a small amount of amperage (microAmps).
- Anything that reduces the resistance from the flame rod to the grounded burner will cause a low microAmp signal.
| Qty |
Possible Causes: |
|
No Flame |
|
Dirty Flame Sensor |
|
Low Gas Pressure |
|
Rusted Burner |
|
Improper Furnace Grounding |