Lochinvar & A.O. Smith 100208394 Pressure Switch

When you're out in the field and a high-efficiency Lochinvar or A.O. Smith unit stays in a lockout loop, the Lochinvar & A.O. Smith 100208394 Pressure Switch is often the first critical safety component you need to bench test. Built for rigorous residential and commercial HVAC boiler and water heater applications, this SPDT (Single Pole Double Throw) switch provides the precise circuit control required to monitor internal pressure levels and prevent equipment damage from overheating or fluctuating drafts. This specific SKU is a direct, identical replacement for the PRS2406 and PRS2406K, widely used in Copper-Fin II and EnergyRite series heaters. It is engineered with a set range of 1 to 5 PSI, ensuring that the control board receives the correct signal to initiate the ignition sequence or safely shut down if the system detects an obstruction in the flue or a failed blower motor. Integrating this OEM replacement part into your HVAC repair workflow ensures compatibility with existing wiring harnesses and mounting brackets, maintaining the original factory specification without the need for field modifications.

• Universal Compatibility: Serves as a direct-fit replacement pressure switch for multiple Lochinvar and A.O. Smith models, including the EnergyRite and Copper-Fin series.
• Precise Safety Control: The 100208394 SPDT Switch logic allows for consistent monitoring, preventing ignition if safe pressure thresholds aren't met.
• Industrial-Grade Construction: Designed to withstand the high temperatures and continuous cycling found in heavy-duty boiler parts environments.
• Error Code Mitigation: Effectively resolves common "Air Pressure SW" or "Gas Pressure SW" fault messages on Lochinvar control interfaces.

• What are the symptoms of a failed 100208394 switch? Typically, you will see the inducer motor run continuously without the igniter glowing, or the control board will throw a specific pressure switch lockout code.
• Is this compatible with PRS2406? Yes, this part is the current manufacturer-sanctioned replacement for both the PRS2406 and the PRS2406K.
• Can I use this for water pressure monitoring? While primarily used in heating systems, this water pressure switch is rated for specific Lochinvar pool and water heater models to ensure proper flow and pressure are maintained during the heating cycle.

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.