Lochinvar & A.O. Smith 100208548 Outlet Sensor

For professional contractors servicing Lochinvar or A.O. Smith systems, the 100208548 Immersion Outlet Sensor is a critical component for maintaining precise thermal regulation. This genuine OEM replacement sensor is an exact match for legacy part numbers TST2054 and TST2054K, as well as 100170595, ensuring a drop-in fit without the need for field modifications. Effectively designed for high-demand applications, this NTC thermistor sensor monitors water temperatures exiting the heat exchanger to prevent overheating and ensure the control board receives accurate resistance data. It is primarily utilized in EnergyRite pool heaters (models ER152 through ER402) and various Lochinvar and A.O. Smith boiler configurations. A failed sensor often results in "Sensor Open" or "Sensor Short" fault codes, leading to system lockout. By using a 100208548 temperature probe, technicians can restore the modulating heating performance and safety limits required for high-efficiency operation.

• Exact OEM Compatibility: Directly replaces part numbers 100208548, TST2054, TST2054K, and 100170595 for seamless integration.
• High Precision Monitoring: Provides accurate immersion-style temperature readings to the integrated control system for optimal thermal efficiency.
• Durable Construction: Engineered to withstand constant immersion in treated water within EnergyRite pool heater heat exchangers.
• Plug-and-Play Installation: Features standard lead lengths and connector pins designed specifically for Lochinvar and A.O. Smith wiring harnesses.

• How do I troubleshoot a Lochinvar 100208548 outlet sensor? To verify performance, measure the resistance across the sensor leads with a multimeter and compare the ohms to the manufacturer's resistance-to-temperature chart; a significant deviation indicates a failed thermistor.
• Does the 100208548 sensor work for all EnergyRite models? Yes, this immersion sensor is the standard outlet monitor for EnergyRite ER152, ER202, ER252, ER302, and ER402 residential and commercial pool heaters.
• What causes a TST2054 outlet sensor to fail? Most failures result from mineral scale buildup on the probe tip or internal moisture penetration, which disrupts the electrical resistance and triggers a control board fault.

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.