What happens when you turn on a gas furnace?
What happens when you turn on a gas furnace?
Situation: You turn the thermostat up, the furnace ignites and the burner comes on. The furnace stays on for awhile (maybe 1 minute, maybe 10 minutes) and then goes out. The fan continues to run even though the flames and pilot light go out.
Why does my furnace not light when I Turn on the heat?
This gives the flame enough time to heat the flame sensor (thermocouple) that tells your furnace it’s OK to light the burner. If it’s still not working, it may be one of the problems above.
How does the pilot light on a gas furnace work?
The pilot light is lit by an electronic spark. A flame sensor lets your furnace know that the pilot was successfully lit. The gas valve sends gas to the main burner(s), which is lit by the pilot light.
Where does the gas go in a direct ignition furnace?
The gas valve sends gas to the main burner(s), which is lit by the pilot light. If you have a direct ignition furnace, you won’t have a pilot light. These furnaces skip steps 3-5 and instead light the burner directly. Your furnace will still have a flame sensor, but it will be over the burner’s flame.
Situation: You turn the thermostat up, the furnace ignites and the burner comes on. The furnace stays on for awhile (maybe 1 minute, maybe 10 minutes) and then goes out. The fan continues to run even though the flames and pilot light go out.
This gives the flame enough time to heat the flame sensor (thermocouple) that tells your furnace it’s OK to light the burner. If it’s still not working, it may be one of the problems above.
The pilot light is lit by an electronic spark. A flame sensor lets your furnace know that the pilot was successfully lit. The gas valve sends gas to the main burner(s), which is lit by the pilot light.
The gas valve sends gas to the main burner(s), which is lit by the pilot light. If you have a direct ignition furnace, you won’t have a pilot light. These furnaces skip steps 3-5 and instead light the burner directly. Your furnace will still have a flame sensor, but it will be over the burner’s flame.
