Lochinvar & A.O. Smith 100208172 Rollout Switch
The Lochinvar & A.O. Smith 100208172 Rollout Switch is a critical safety component designed for manual reset operation in high-efficiency gas-fired boilers and water heaters. Rated at a 250°F trip temperature, this flame rollout limit switch monitors the burner enclosure for abnormal thermal conditions. If combustion flames spill out of the heat exchanger—often due to a cracked heat exchanger, blocked venting, or a failing inducer motor—the switch opens the circuit to immediately terminate the 100% gas flow. As an OEM replacement part for the obsolete Lochinvar HLC2903, this 250-degree sensor ensures precise system safety and heat management. It is a direct fit for Lochinvar Knight and A.O. Smith models, including the CWN399PM and CWN500PM series. For professional contractors, verifying continuity with a multimeter is the standard protocol before replacing this HVAC safety switch to prevent nuisance tripping and ensure reliable boiler ignition cycles.
Key Benefits for HVAC Professionals
- Precise 250°F Calibration: engineered to prevent equipment damage by detecting excessive heat at the burner box.
- Manual Reset Safety: requires a technician to inspect the system for blockage or heat exchanger failure before regaining operation.
- Direct OEM Compatibility: drop-in replacement for Lochinvar 100208172 and legacy HLC2903 components.
- Rugged Construction: built to withstand the high-temperature environment of commercial and residential gas-fired appliances.
- Verified Performance: ensures HVAC safety compliance by preventing dangerous carbon monoxide rollout into the mechanical room.
Common Questions
What causes a 250F rollout switch to trip?
Tripping is typically caused by a restricted flue vent, a soot-clogged heat exchanger, or insufficient draft from the inducer fan, causing flames to "roll out" toward the burners instead of being drawn into the exchanger.
Can I bypass this switch for testing?
No. Bypassing a flame rollout switch is a severe safety hazard. If the switch trips, a technician must identify the underlying cause of the thermal spike before resetting the device.
How do I test the 100208172 for failure?
Using a multimeter set to the lowest Ohms scale, check for continuity across the terminals while the reset button is depressed. No continuity indicates a failed internal bimetal disc that requires a complete 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.
Lochinvar & A.O. Smith 100208172 Rollout Switch
The Lochinvar & A.O. Smith 100208172 Rollout Switch is a critical safety component designed for manual reset operation in high-efficiency gas-fired boilers and water heaters. Rated at a 250°F trip temperature, this flame rollout limit switch monitors the burner enclosure for abnormal thermal conditions. If combustion flames spill out of the heat exchanger—often due to a cracked heat exchanger, blocked venting, or a failing inducer motor—the switch opens the circuit to immediately terminate the 100% gas flow. As an OEM replacement part for the obsolete Lochinvar HLC2903, this 250-degree sensor ensures precise system safety and heat management. It is a direct fit for Lochinvar Knight and A.O. Smith models, including the CWN399PM and CWN500PM series. For professional contractors, verifying continuity with a multimeter is the standard protocol before replacing this HVAC safety switch to prevent nuisance tripping and ensure reliable boiler ignition cycles.
Key Benefits for HVAC Professionals
- Precise 250°F Calibration: engineered to prevent equipment damage by detecting excessive heat at the burner box.
- Manual Reset Safety: requires a technician to inspect the system for blockage or heat exchanger failure before regaining operation.
- Direct OEM Compatibility: drop-in replacement for Lochinvar 100208172 and legacy HLC2903 components.
- Rugged Construction: built to withstand the high-temperature environment of commercial and residential gas-fired appliances.
- Verified Performance: ensures HVAC safety compliance by preventing dangerous carbon monoxide rollout into the mechanical room.
Common Questions
What causes a 250F rollout switch to trip?
Tripping is typically caused by a restricted flue vent, a soot-clogged heat exchanger, or insufficient draft from the inducer fan, causing flames to "roll out" toward the burners instead of being drawn into the exchanger.
Can I bypass this switch for testing?
No. Bypassing a flame rollout switch is a severe safety hazard. If the switch trips, a technician must identify the underlying cause of the thermal spike before resetting the device.
How do I test the 100208172 for failure?
Using a multimeter set to the lowest Ohms scale, check for continuity across the terminals while the reset button is depressed. No continuity indicates a failed internal bimetal disc that requires a complete 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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lochinvar & A.O. Smith 100208172 Rollout Switch is a critical safety component designed for manual reset operation in high-efficiency gas-fired boilers and water heaters. Rated at a 250°F trip temperature, this flame rollout limit switch monitors the burner enclosure for abnormal thermal conditions. If combustion flames spill out of the heat exchanger—often due to a cracked heat exchanger, blocked venting, or a failing inducer motor—the switch opens the circuit to immediately terminate the 100% gas flow. As an OEM replacement part for the obsolete Lochinvar HLC2903, this 250-degree sensor ensures precise system safety and heat management. It is a direct fit for Lochinvar Knight and A.O. Smith models, including the CWN399PM and CWN500PM series. For professional contractors, verifying continuity with a multimeter is the standard protocol before replacing this HVAC safety switch to prevent nuisance tripping and ensure reliable boiler ignition cycles.
Key Benefits for HVAC Professionals
- Precise 250°F Calibration: engineered to prevent equipment damage by detecting excessive heat at the burner box.
- Manual Reset Safety: requires a technician to inspect the system for blockage or heat exchanger failure before regaining operation.
- Direct OEM Compatibility: drop-in replacement for Lochinvar 100208172 and legacy HLC2903 components.
- Rugged Construction: built to withstand the high-temperature environment of commercial and residential gas-fired appliances.
- Verified Performance: ensures HVAC safety compliance by preventing dangerous carbon monoxide rollout into the mechanical room.
Common Questions
What causes a 250F rollout switch to trip?
Tripping is typically caused by a restricted flue vent, a soot-clogged heat exchanger, or insufficient draft from the inducer fan, causing flames to "roll out" toward the burners instead of being drawn into the exchanger.
Can I bypass this switch for testing?
No. Bypassing a flame rollout switch is a severe safety hazard. If the switch trips, a technician must identify the underlying cause of the thermal spike before resetting the device.
How do I test the 100208172 for failure?
Using a multimeter set to the lowest Ohms scale, check for continuity across the terminals while the reset button is depressed. No continuity indicates a failed internal bimetal disc that requires a complete 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.
