Lochinvar & A.O. Smith 100289391 Pressure Switch
The Lochinvar & A.O. Smith 100289391 Pressure Switch is a critical safety component engineered for high-efficiency condensing water heaters and commercial boilers. Calibrated to a 0.55" WC (Water Column) set point, this direct replacement for 100294588 monitors the induced draft blower to ensure proper venting of combustion gases. In the field, this switch is the primary defense against blocked flue conditions and inducer motor failure, preventing the ignition sequence if the required negative pressure is not maintained. This OEM pressure switch features a durable diaphragm designed for the high-cycle demands of modern HVACR systems, ensuring precise pressure sensing and electrical continuity during the heating cycle.
For technicians troubleshooting a 3-blink error code or a "Pressure Switch Failed Open" status, the 100289391 provides the exact technical specifications required for Lochinvar Copper-Fin II and A.O. Smith Cyclone models. Using a genuine replacement part eliminates the calibration drift often seen with universal alternatives, maintaining the factory-original safety circuit integrity. Whether you are performing a water heater repair or a routine HVAC system maintenance check, this 0.55" pressure switch offers the reliability needed for commercial heating equipment and residential power-vent units.
Key Benefits for HVACR Contractors:- Universal Compatibility: Validated as a direct 1-to-1 substitute for the 100294588, simplifying inventory management for service vans.
- OEM Precision: Factory-set at 0.55" WC to ensure the combustion process remains within safe manufacturer parameters.
- Rugged Construction: Built with high-grade materials to resist condensate buildup and diaphragm fatigue in fan-assisted heaters.
- Simplified Installation: Features standard spade terminals and sensing ports for a fast swap in the field.
- What causes this switch to stay open? Typically, a blocked vent pipe, a failing inducer fan, or condensate trapped in the sensing tube will prevent the switch from closing.
- How do I verify the switch is faulty? Use a manometer to confirm the system is pulling at least 0.55" WC. If the pressure is sufficient but the multimeter shows no continuity, the switch requires replacement.
- Can I use a higher WC rated switch? No. Using a switch with an incorrect WC rating can lead to dangerous combustion issues or frequent lockout codes.
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.
Original: $30.36
-65%$30.36
$10.63Lochinvar & A.O. Smith 100289391 Pressure Switch
The Lochinvar & A.O. Smith 100289391 Pressure Switch is a critical safety component engineered for high-efficiency condensing water heaters and commercial boilers. Calibrated to a 0.55" WC (Water Column) set point, this direct replacement for 100294588 monitors the induced draft blower to ensure proper venting of combustion gases. In the field, this switch is the primary defense against blocked flue conditions and inducer motor failure, preventing the ignition sequence if the required negative pressure is not maintained. This OEM pressure switch features a durable diaphragm designed for the high-cycle demands of modern HVACR systems, ensuring precise pressure sensing and electrical continuity during the heating cycle.
For technicians troubleshooting a 3-blink error code or a "Pressure Switch Failed Open" status, the 100289391 provides the exact technical specifications required for Lochinvar Copper-Fin II and A.O. Smith Cyclone models. Using a genuine replacement part eliminates the calibration drift often seen with universal alternatives, maintaining the factory-original safety circuit integrity. Whether you are performing a water heater repair or a routine HVAC system maintenance check, this 0.55" pressure switch offers the reliability needed for commercial heating equipment and residential power-vent units.
Key Benefits for HVACR Contractors:- Universal Compatibility: Validated as a direct 1-to-1 substitute for the 100294588, simplifying inventory management for service vans.
- OEM Precision: Factory-set at 0.55" WC to ensure the combustion process remains within safe manufacturer parameters.
- Rugged Construction: Built with high-grade materials to resist condensate buildup and diaphragm fatigue in fan-assisted heaters.
- Simplified Installation: Features standard spade terminals and sensing ports for a fast swap in the field.
- What causes this switch to stay open? Typically, a blocked vent pipe, a failing inducer fan, or condensate trapped in the sensing tube will prevent the switch from closing.
- How do I verify the switch is faulty? Use a manometer to confirm the system is pulling at least 0.55" WC. If the pressure is sufficient but the multimeter shows no continuity, the switch requires replacement.
- Can I use a higher WC rated switch? No. Using a switch with an incorrect WC rating can lead to dangerous combustion issues or frequent lockout codes.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lochinvar & A.O. Smith 100289391 Pressure Switch is a critical safety component engineered for high-efficiency condensing water heaters and commercial boilers. Calibrated to a 0.55" WC (Water Column) set point, this direct replacement for 100294588 monitors the induced draft blower to ensure proper venting of combustion gases. In the field, this switch is the primary defense against blocked flue conditions and inducer motor failure, preventing the ignition sequence if the required negative pressure is not maintained. This OEM pressure switch features a durable diaphragm designed for the high-cycle demands of modern HVACR systems, ensuring precise pressure sensing and electrical continuity during the heating cycle.
For technicians troubleshooting a 3-blink error code or a "Pressure Switch Failed Open" status, the 100289391 provides the exact technical specifications required for Lochinvar Copper-Fin II and A.O. Smith Cyclone models. Using a genuine replacement part eliminates the calibration drift often seen with universal alternatives, maintaining the factory-original safety circuit integrity. Whether you are performing a water heater repair or a routine HVAC system maintenance check, this 0.55" pressure switch offers the reliability needed for commercial heating equipment and residential power-vent units.
Key Benefits for HVACR Contractors:- Universal Compatibility: Validated as a direct 1-to-1 substitute for the 100294588, simplifying inventory management for service vans.
- OEM Precision: Factory-set at 0.55" WC to ensure the combustion process remains within safe manufacturer parameters.
- Rugged Construction: Built with high-grade materials to resist condensate buildup and diaphragm fatigue in fan-assisted heaters.
- Simplified Installation: Features standard spade terminals and sensing ports for a fast swap in the field.
- What causes this switch to stay open? Typically, a blocked vent pipe, a failing inducer fan, or condensate trapped in the sensing tube will prevent the switch from closing.
- How do I verify the switch is faulty? Use a manometer to confirm the system is pulling at least 0.55" WC. If the pressure is sufficient but the multimeter shows no continuity, the switch requires replacement.
- Can I use a higher WC rated switch? No. Using a switch with an incorrect WC rating can lead to dangerous combustion issues or frequent lockout codes.
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.
