I completed a repair on a Rheem Classic Series furnace, model RGRA-09EZAJS, which was experiencing ignition failures. Upon diagnosis, I found the ignitor to be faulty. After replacing the old ignitor with a new one, I tested the system to ensure it was firing correctly. Additionally, I checked the furnace's airflow and heat output for efficiency. The furnace is now operating smoothly, providing consistent and reliable heating throughout the home.