Addressed a no-heat issue in a Rheem Classic Series Gas Furnace, model RGPN-07EAMER. Diagnosed a faulty ignition system and a clogged air filter hindering operation. Replaced the ignition module with an exact match, Rheem part 62-24164-01, and installed a new Honeywell Elite Allergen air filter, model HPA200, to ensure proper airflow. Tested the system post-repair to confirm restored heat output and efficiency.