Making sure the furnace flame sensor is clean and in good condition not only prevents a furnace malfunction, but also ensures safety. If the furnace ignitor malfunctions, natural gas continues to flow through the furnace without the flame. The flame sensor shuts the gas off if it does not sense the flame. #furnacesafety #homeownertips #homeownership #furnacemaintenance #furnacetuneup #hvactechnician #onehourheatingandairconditioning #olathe | One Hour Heating & Air Conditioning of Johnson County