Any heating and cooling Guys out there? I have a question

This furnace does NOT have a thermocouple , thermocouples are used on standing pilot furnaces, this model you have has a spark ignition to ignite gas. The members who suggest the flame sensor are correct, a quick fix is a cleaning of the sensor with fine sand paper emery cloth is perfect. But for the cost of the sensor ($15-$25) get a new one ASAP or it may just happen again. Depending on the model furnace you have it could have a two stage gas valve as well. My job, HVAC Foreman