Use a multimeter to check the coil resistance

a restricted flue pipe

Industrial Construction: Features a moisture-resistant aluminum housing and non-PCB oil for stable operation in high-ambient temperatures

or PAH and confirm the blower wheel diameter matches 4

Weil McLain 450-021-242 Draft Diverter R-410A Use a multimeter to checkThe Weil McLain 450 021 242 Draft Diverter is a critical atmospheric venting component designed specifically for CG, CGX, and CGI Series gas fired boilers. This 5" to 6" integral draft hood ensures proper combustion gas dilution and maintains a consistent neutral pressure point at the flue outlet, protecting the burner flame from down drafts and fluctuating chimney pressures. Engineered for durability, this replacement part facilitates the transition