Aaon R51280 Limit Switch 320788-703 Inspect the stainless steel probes

Inspect the stainless steel probes for scale buildup or rust

As a Normally Open (NO) solenoid valve

typically those with spark ignition and specific control codes

and Direct Comfort units

Aaon R51280 Limit Switch 320788-703 Inspect the stainless steel probesThe Aaon R51280 Limit Switch is a critical safety component engineered for precision temperature monitoring in high performance HVAC systems. This 3 inch L195 30F limit switch features a fixed temperature setting designed to open the electrical circuit at 195F and automatically reset when temperatures drop by 30F. As a vital HVAC high limit control, it prevents equipment overheating by interrupting power to the heat source if airflow is restricted or