Lochinvar & A.O. Smith 100109954 Pressure Switch

When you're out in the field and a BTI or BTN series water heater starts acting up, the Lochinvar & A.O. Smith 100109954 Pressure Switch is likely the component you need to check. This genuine OEM pressure switch kit is engineered for a precise -1.95" WC (Water Column) set point, ensuring the inducer is pulling the correct draft before allowing the ignition sequence to proceed. As a normally open k-switch air pressure sensor, it provides critical safety feedback by monitoring the differential pressure in residential and commercial water heaters. Using this replacement part ensures the burner only fires under safe venting conditions, preventing backspeed and potential CO issues. This specific kit, also known as the Lochinvar 100109954, comes ready to install with an exact fit for HVAC and water heating equipment that specifies this exact negative pressure rating. Trusting original manufacturer specs like this 100109954 air pressure switch maintain the efficiency and safety of high-performance Lochinvar and A.O. Smith systems.

• OEM Compliance: Specifically designed for Lochinvar and A.O. Smith water heaters, ensuring the switch matches factory-calibrated set points.
• Precise Calibration: Features a -1.95" WC trip point to accurately monitor intake and exhaust pressure differentials.
• Enhanced Safety: Prevents the combustion process if venting or inducer performance is obstructed or inadequate.
• Kit Completeness: The 100109954 pressure switch kit includes the necessary components for a direct swap-out during a service call.

• What are the symptoms of a failing 100109954 pressure switch? Usually, the unit will attempt to start the inducer motor, but it will fail to spark or ignite, often throwing a pressure switch error code on the control board.
• Can I use a universal pressure switch instead? No, HVAC pros know that these BTN and BTI models require a specific -1.95" WC rating. A mismatched switch can lead to premature failure or dangerous operating conditions.
• Is this switch compatible with my specific model? This part is specifically sized for Lochinvar & A.O. Smith pressure switch applications in the BTI and BTN series. Always verify the part number on the old switch's label before replacement.

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.