Lochinvar & A.O. Smith 100288429 Switch
The Lochinvar & A.O. Smith 100288429 Switch is a critical safety component designed for precise air pressure sensing in high-efficiency heating systems. This OEM replacement part is factory-calibrated to a 3.90" water column (WC) set point, serving as a primary air proving switch to ensure the blower motor is moving sufficient combustion air before the ignition sequence begins. Engineered for compatibility with specific Lochinvar boilers and A.O. Smith water heaters—including various commercial and residential power-vented models—this switch prevents hazardous operation by opening the electrical circuit if venting or intake blockages are detected. Dealing with PRS2435 or 100166180 cross-references? This is the direct genuine replacement needed to restore system integrity. For professional contractors, installing this differential pressure switch ensures the equipment maintains its specific AFUE rating and meets stringent safety sequences without the reliability issues common to universal aftermarket alternatives.
- Precise 3.90" WC Calibration: Ensures the system only fires under optimal airflow conditions, protecting the heat exchanger.
- Direct OEM Compatibility: Replaces Lochinvar 100166180 and A.O. Smith legacy part numbers for a drop-in fit.
- Rugged Diaphragm Construction: Designed to withstand the high-temperature environments of commercial mechanical rooms.
- Proving Switch Reliability: Vital for safety lockout sequences and preventing the accumulation of unburned fuel.
What are the symptoms of a failing 100288429 pressure switch?
Usually, the system will cycle the inducer blower but fail to initiate ignition, often throwing a "Pressure Switch Stuck Open" or "Airflow Fault" code on the control board.
Can this switch be used if the existing unit has a different WC rating?
No. Pressure switches are safety devices calibrated to the specific blower performance of the unit. Using a switch with a different water column rating can lead to incomplete combustion or dangerous operating conditions.
How do I verify if the switch or the venting is the problem?
Use a digital manometer to measure the actual pressure at the sensing port while the inducer is running. If the pressure exceeds 3.90" WC but the 100288429 switch fails to close, the switch requires replacement.
This item is not eligible for free shipping.
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: $143.13
-65%$143.13
$50.10Lochinvar & A.O. Smith 100288429 Switch
The Lochinvar & A.O. Smith 100288429 Switch is a critical safety component designed for precise air pressure sensing in high-efficiency heating systems. This OEM replacement part is factory-calibrated to a 3.90" water column (WC) set point, serving as a primary air proving switch to ensure the blower motor is moving sufficient combustion air before the ignition sequence begins. Engineered for compatibility with specific Lochinvar boilers and A.O. Smith water heaters—including various commercial and residential power-vented models—this switch prevents hazardous operation by opening the electrical circuit if venting or intake blockages are detected. Dealing with PRS2435 or 100166180 cross-references? This is the direct genuine replacement needed to restore system integrity. For professional contractors, installing this differential pressure switch ensures the equipment maintains its specific AFUE rating and meets stringent safety sequences without the reliability issues common to universal aftermarket alternatives.
- Precise 3.90" WC Calibration: Ensures the system only fires under optimal airflow conditions, protecting the heat exchanger.
- Direct OEM Compatibility: Replaces Lochinvar 100166180 and A.O. Smith legacy part numbers for a drop-in fit.
- Rugged Diaphragm Construction: Designed to withstand the high-temperature environments of commercial mechanical rooms.
- Proving Switch Reliability: Vital for safety lockout sequences and preventing the accumulation of unburned fuel.
What are the symptoms of a failing 100288429 pressure switch?
Usually, the system will cycle the inducer blower but fail to initiate ignition, often throwing a "Pressure Switch Stuck Open" or "Airflow Fault" code on the control board.
Can this switch be used if the existing unit has a different WC rating?
No. Pressure switches are safety devices calibrated to the specific blower performance of the unit. Using a switch with a different water column rating can lead to incomplete combustion or dangerous operating conditions.
How do I verify if the switch or the venting is the problem?
Use a digital manometer to measure the actual pressure at the sensing port while the inducer is running. If the pressure exceeds 3.90" WC but the 100288429 switch fails to close, the switch requires replacement.
This item is not eligible for free shipping.
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.
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Product Information
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Description
The Lochinvar & A.O. Smith 100288429 Switch is a critical safety component designed for precise air pressure sensing in high-efficiency heating systems. This OEM replacement part is factory-calibrated to a 3.90" water column (WC) set point, serving as a primary air proving switch to ensure the blower motor is moving sufficient combustion air before the ignition sequence begins. Engineered for compatibility with specific Lochinvar boilers and A.O. Smith water heaters—including various commercial and residential power-vented models—this switch prevents hazardous operation by opening the electrical circuit if venting or intake blockages are detected. Dealing with PRS2435 or 100166180 cross-references? This is the direct genuine replacement needed to restore system integrity. For professional contractors, installing this differential pressure switch ensures the equipment maintains its specific AFUE rating and meets stringent safety sequences without the reliability issues common to universal aftermarket alternatives.
- Precise 3.90" WC Calibration: Ensures the system only fires under optimal airflow conditions, protecting the heat exchanger.
- Direct OEM Compatibility: Replaces Lochinvar 100166180 and A.O. Smith legacy part numbers for a drop-in fit.
- Rugged Diaphragm Construction: Designed to withstand the high-temperature environments of commercial mechanical rooms.
- Proving Switch Reliability: Vital for safety lockout sequences and preventing the accumulation of unburned fuel.
What are the symptoms of a failing 100288429 pressure switch?
Usually, the system will cycle the inducer blower but fail to initiate ignition, often throwing a "Pressure Switch Stuck Open" or "Airflow Fault" code on the control board.
Can this switch be used if the existing unit has a different WC rating?
No. Pressure switches are safety devices calibrated to the specific blower performance of the unit. Using a switch with a different water column rating can lead to incomplete combustion or dangerous operating conditions.
How do I verify if the switch or the venting is the problem?
Use a digital manometer to measure the actual pressure at the sensing port while the inducer is running. If the pressure exceeds 3.90" WC but the 100288429 switch fails to close, the switch requires replacement.
This item is not eligible for free shipping.
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.
