A pilot light is a small flame that’s constantly lit within a gas furnace. It’s the ignition source for the main gas burner when it’s activated by the thermostat.

We may receive a commission on purchases made from links. It can be frustrating when a gas pilot light goes out. Not only will your gas furnace, fireplace, stove, or water heater stop working, but you ...

You should be able to see it easily. Open up the door and look for a small flame inside. There's no mistaking it, because it's an actual flame of fire inside the furnace. This is what's called the ...

5. Check for proper ignition: Once the pilot light is lit, check to ensure that it’s heating up properly and appears stable. If it seems weak or unsteady, turn off the gas valve, wait a few minutes, ...