Heating system diagnosed and found fault in the igniter. Also, system is extremely dirty, restricted airflow. System is overheating due to restricted blower motor and wheel. Showed customer extent of dust and debris in system. Installed new igniter and system is now running. Furnace needs additional repairs. Wants to tackle this spring- mid April. Average life of a system is 10-15 years. Furnace and air conditioner are 16 years old now.