Arrived to no heat service call and performed system evaluation. Furnace was in need of maintenance pretty bad all sensors were corroded and needed service. Thermostat improperly configured also. Informed customer maintenance was the issue. Spoke with customer about options. Customer chose to join blue shield protection plan furnace maintenance today. I performed first tune up today and we will return to service ac in spring. Customer recently replaced filter. Cleaned flame sensor and and tested ignitor. Test induced draft motor. Test ecm motor amp draw. All amp draw in range. 90 percent drain is clear. Test unit in all modes. System is heating at this time.