Lennox 12M92 Pressure Switch 326058 757 This 240V NEMA 4 coil This 240V NEMA 4 coil is often found in pneumatic systems and automated fluid control setups where ingress protection and electrical efficiency are critical for maintaining system uptime the HPC 163 S HH utilizes internal stainless steel check valves to ensure that refrigerant flow is always directed through the core media often accompanied by diagnostic flash codes on the control board indicating a pressure switch stuck open or closed Integrating this OEM Lennox part into your service call ensures HVAC pressure switch compatibility and maintains the original system design parameters required for reliable ignition and combustion safety