Lochinvar & A.O. Smith 100111914 Pressure Switch

For service professionals maintaining Lochinvar and A.O. Smith high-efficiency systems, the Lochinvar & A.O. Smith 100111914 Pressure Switch is the mandatory OEM solution for restoring proper sequence of operation. This air pressure switch is a precision-calibrated safety component designed to verify adequate blower performance and venting integrity before allowing the ignition cycle to proceed. It serves as a direct-fit replacement for furnace and water heater models GAHH-40 and GAHH-50, effectively replacing older or obstructed units like the NS2-1138-00. Built to withstand the high-demand environments of HVACR commercial and residential applications, this switch ensures that your equipment operates within specified pneumatic parameters, preventing hazardous conditions associated with blocked flues or failed inducer motors. By utilizing this genuine Lochinvar replacement part, contractors can ensure seamless integration with existing control boards and wiring harnesses, maintaining the factory-specified safety standards of the heating appliance.

• Universal Compatibility: Engineered specifically as a 100111914 air pressure switch for GAHH-40 and GAHH-50 units, ensuring zero field modifications.
• Exact OEM Specs: An identical match to the NS2-1138-00, providing the exact set points required for reliable pressure sensing.
• Critical Safety Logic: Actively monitors for blocked vents or blower failure to protect the heat exchanger and prevent carbon monoxide issues.
• Rugged Construction: Designed for longevity in high-cycle A.O. Smith water heaters and boilers.

Is the 100111914 the same as the NS2-1138-00?
Yes, these part numbers are functionally identical. The 100111914 is the current OEM designation used for servicing modern Lochinvar and A.O. Smith equipment.

What are the signs that this pressure switch needs replacement?
Common symptoms include the inducer motor running without the burner igniting, or the control board throwing a "Pressure Switch Stuck Open" or "Closed" fault code. Always verify that the sensing tubing is clear of moisture and debris before replacing the hardware.

Can this be used on other high-efficiency water heaters?
This switch is specifically calibrated for the airflow requirements of Lochinvar GAHH-40 and GAHH-50 series. Using it on non-specified models may lead to improper combustion or safety lockouts.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.