CALL BACK NO HEAT, INSTALLED 3 TON FURNACE, 10YP. 5YL. MADE SURE EQUIPMENT WAS INSTALLED PROPERLY AND LEFT WORK AREA CLEAN WHEN JOB WAS COMPLETE. CHECK BURNER AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND PROPER VENTING. CHECK THERMOSTAT, AIRFLOW, AIR FILTER, HIGH LIMIT CONTROL, FAN CONTROL, HEAT EXCHANGER, AND ALL ELECTRICAL CONNECTIONS. CHECK BLOWER COMPONENTS. EVERYTHING IS RUNNING GOOD.