Lennox 15W77 Blower Wheel 318973-401 the limit switch has failed

the limit switch has failed and must be replaced

Installing this furnace air pressure switch prevents system malfunctions and ensures the burner only ignites when safe venting conditions are fully established

maintaining factory-specified airflow across the blower assembly for consistent discharge temperatures and system efficiency

Common Questions Which gas valve does the FP-26 work with

including the 38ARZ

Lennox 15W77 Blower Wheel 318973-401 the limit switch has failedThe Lennox 15W77 Blower Wheel is a precision engineered direct drive blower wheel designed for high efficiency airflow management in commercial and residential HVAC systems. Featuring an 11 inch diameter and 10 inch width, this OEM Lennox replacement part (replaces LB 29333BDC) provides the necessary centrifugal force to maintain consistent indoor temperatures. The 1 2 inch bore ensures a secure fit on standard motor shafts, while the CCW (Counter