Reznor 100799 Limit Control which typically points to a

which typically points to a restricted or fouled distributor orifice

Skin oils can create hot spots that lead to premature failure

as it easily masks the footprint of legacy devices

check for continuity across the terminals while the switch is below 140°F

or a failing transformer

Reznor 100799 Limit Control which typically points to aThe Reznor 100799 Limit Control is a critical safety component designed for precise thermal regulation within Reznor unit heaters. This L150 25F high limit switch operates with a fixed temperature setpoint, featuring an open on rise configuration at 150F and a 25F differential for reset. Engineered for rapid response to heat exchanger over temperature conditions, this SPST limit switch ensures the burner circuit is interrupted if airflow is restricted