A furnace flame sensor is a device that's found in the burner assembly of your home's furnace. This thin metal rod sits directly facing the furnace's flame stream, and it tells the furnace whether ignition has occurred once the gas valve has been opened. If the gas valve has been opened and the sensor fails to detect a flame, the furnace will automatically shut down.
"Very impressed. Returned call within 24 hours. They came out the same day I spoke with them and made the repair within 25 minutes. Very low service call fee. I had another repair service out two weeks earlier and after 3 service calls and the central air still not fixed and temperatures in the high 90's, it was such a relief to have a company identify the problem, have the necessary part with them and fix the problem."