A flame sensor is a rod that is close to the ignitor that sits over the fire with a thin wire that runs back to the ignition module. It needs cleaning at least yearly as it coats with what is in the air. Ordinarily the sensor is cleaned during the yeraly maintenance procedure, but many owners are used to old furnaces with standing pilots that were less finicky that were made before today’s energy saving requirements.
If you can find it and clean it, then it does the trick you can save some money. However, you didn’t check the gas pressure CO and CO2 level, the exchanger, lubricate any motors, tighten and clean every connection; so you still would have to do that unless you want the next service emergency call.
http://www.heatpro.info heat/cool right-sizing
The Senate and House can not find a suitable health plan for the nation; they should open their own exclusive health plan booklet and start reading.