If the status LED shows a specific lockout code related to internal communication or relay failure

ensuring consistent airflow across various duct configurations

this York original equipment part provides the reliability necessary for maintaining high-performance HVACR standards in the field

This SPST (Single Pole Single Throw) controller is specifically designed for unit heaters

For potable water or open heating systems

Lochinvar & A.O. Smith 100166238 Switch 318820-201 If the status LED showsThe Lochinvar & A. O. Smith 100166238 Gas Pressure Switch is a critical safety component designed for high performance gas fired boilers and commercial water heaters. Featuring a 1 20" WC adjustable range, this manual reset gas pressure switch ensures system integrity by monitoring incoming or manifold gas pressure. If pressures deviate from the calibrated setpoint, the switch initiates a safety lockout, preventing hazardous combustion conditions.