Lochinvar & A.O. Smith 100170487 Upper Sensor
The Lochinvar & A.O. Smith 100170487 Upper Sensor (formerly TST1187) is a critical thermistor-based component engineered for high-precision temperature monitoring in residential and commercial water heaters. As a direct-immersion NTC temperature sensor, it provides real-time resistance feedback to the control board, ensuring the appliance maintains optimal setpoints while preventing dangerous high-limit conditions. This OEM water heater sensor is specifically designed for the upper tank position to monitor thermal stratification and trigger heating cycles with accuracy. For contractors, installing this authentic Lochinvar replacement part ensures seamless communication between the tank temperature probe and the ignition control module. Built to withstand constant hydronic exposure, the 100170487 sensor utilizes a robust 1/4-inch NPT or clip-in mounting style (depending on original manifold configuration) to provide a leak-proof seal. Whether you are troubleshooting "Sensor Shorted" fault codes or "Delta T High" errors on armor or charger models, this sensor is the industry standard for restoring system reliability and energy efficiency.
Key Benefits for HVACR Professionals- Precision Thermal Regulation: Delivers accurate analog data to the controller to prevent temperature overshoot and short-cycling.
- Broad Compatibility: Engineered as the primary upper limit sensor for a wide range of Lochinvar Armor and A.O. Smith commercial water heaters.
- Direct OEM Replacement: Replaces obsolete part number TST1187 with modernized calibration for consistent resistance-to-temperature curves.
- Enhanced System Safety: Acts as a vital failsafe by detecting threshold breaches, protecting the heat exchanger from thermal stress.
- Simplified Installation: Standardized connector interface allows for rapid field replacement during routine maintenance or emergency service calls.
What are the symptoms of a failing 100170487 upper sensor?
Common indicators include "Sensor Open" or "Sensor Shorted" fault messages on the digital interface, fluctuating water temperatures, or the unit failing to initiate the ignition sequence despite a call for heat.
How do I verify the integrity of the 100170487 sensor in the field?
Technicians should perform a resistance check using a multimeter set to the k-ohm scale. Compare the measured resistance against the manufacturer’s temperature-resistance chart; significant deviations indicate a drifted or failed thermistor.
Can this sensor be used in the lower tank position?
While physically similar, this specific model is calibrated for upper thermal monitoring. Always verify the part number against your specific model's service manual to ensure correct control logic alignment.
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: $165.24
-65%$165.24
$57.83Lochinvar & A.O. Smith 100170487 Upper Sensor
The Lochinvar & A.O. Smith 100170487 Upper Sensor (formerly TST1187) is a critical thermistor-based component engineered for high-precision temperature monitoring in residential and commercial water heaters. As a direct-immersion NTC temperature sensor, it provides real-time resistance feedback to the control board, ensuring the appliance maintains optimal setpoints while preventing dangerous high-limit conditions. This OEM water heater sensor is specifically designed for the upper tank position to monitor thermal stratification and trigger heating cycles with accuracy. For contractors, installing this authentic Lochinvar replacement part ensures seamless communication between the tank temperature probe and the ignition control module. Built to withstand constant hydronic exposure, the 100170487 sensor utilizes a robust 1/4-inch NPT or clip-in mounting style (depending on original manifold configuration) to provide a leak-proof seal. Whether you are troubleshooting "Sensor Shorted" fault codes or "Delta T High" errors on armor or charger models, this sensor is the industry standard for restoring system reliability and energy efficiency.
Key Benefits for HVACR Professionals- Precision Thermal Regulation: Delivers accurate analog data to the controller to prevent temperature overshoot and short-cycling.
- Broad Compatibility: Engineered as the primary upper limit sensor for a wide range of Lochinvar Armor and A.O. Smith commercial water heaters.
- Direct OEM Replacement: Replaces obsolete part number TST1187 with modernized calibration for consistent resistance-to-temperature curves.
- Enhanced System Safety: Acts as a vital failsafe by detecting threshold breaches, protecting the heat exchanger from thermal stress.
- Simplified Installation: Standardized connector interface allows for rapid field replacement during routine maintenance or emergency service calls.
What are the symptoms of a failing 100170487 upper sensor?
Common indicators include "Sensor Open" or "Sensor Shorted" fault messages on the digital interface, fluctuating water temperatures, or the unit failing to initiate the ignition sequence despite a call for heat.
How do I verify the integrity of the 100170487 sensor in the field?
Technicians should perform a resistance check using a multimeter set to the k-ohm scale. Compare the measured resistance against the manufacturer’s temperature-resistance chart; significant deviations indicate a drifted or failed thermistor.
Can this sensor be used in the lower tank position?
While physically similar, this specific model is calibrated for upper thermal monitoring. Always verify the part number against your specific model's service manual to ensure correct control logic alignment.
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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Description
The Lochinvar & A.O. Smith 100170487 Upper Sensor (formerly TST1187) is a critical thermistor-based component engineered for high-precision temperature monitoring in residential and commercial water heaters. As a direct-immersion NTC temperature sensor, it provides real-time resistance feedback to the control board, ensuring the appliance maintains optimal setpoints while preventing dangerous high-limit conditions. This OEM water heater sensor is specifically designed for the upper tank position to monitor thermal stratification and trigger heating cycles with accuracy. For contractors, installing this authentic Lochinvar replacement part ensures seamless communication between the tank temperature probe and the ignition control module. Built to withstand constant hydronic exposure, the 100170487 sensor utilizes a robust 1/4-inch NPT or clip-in mounting style (depending on original manifold configuration) to provide a leak-proof seal. Whether you are troubleshooting "Sensor Shorted" fault codes or "Delta T High" errors on armor or charger models, this sensor is the industry standard for restoring system reliability and energy efficiency.
Key Benefits for HVACR Professionals- Precision Thermal Regulation: Delivers accurate analog data to the controller to prevent temperature overshoot and short-cycling.
- Broad Compatibility: Engineered as the primary upper limit sensor for a wide range of Lochinvar Armor and A.O. Smith commercial water heaters.
- Direct OEM Replacement: Replaces obsolete part number TST1187 with modernized calibration for consistent resistance-to-temperature curves.
- Enhanced System Safety: Acts as a vital failsafe by detecting threshold breaches, protecting the heat exchanger from thermal stress.
- Simplified Installation: Standardized connector interface allows for rapid field replacement during routine maintenance or emergency service calls.
What are the symptoms of a failing 100170487 upper sensor?
Common indicators include "Sensor Open" or "Sensor Shorted" fault messages on the digital interface, fluctuating water temperatures, or the unit failing to initiate the ignition sequence despite a call for heat.
How do I verify the integrity of the 100170487 sensor in the field?
Technicians should perform a resistance check using a multimeter set to the k-ohm scale. Compare the measured resistance against the manufacturer’s temperature-resistance chart; significant deviations indicate a drifted or failed thermistor.
Can this sensor be used in the lower tank position?
While physically similar, this specific model is calibrated for upper thermal monitoring. Always verify the part number against your specific model's service manual to ensure correct control logic alignment.
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.
