Lochinvar & A.O. Smith 100110950 Probe

The Lochinvar & A.O. Smith 100110950 Probe is a critical thermostat lower probe designed for high-precision temperature monitoring in commercial and residential water heaters and boilers. As a genuine OEM replacement part, this sensory component ensures that the heating system maintains consistent water temperatures at the tank's bottom, preventing thermal stress and optimizing energy consumption. For technicians, installing a calibrated 100110950 temperature sensor is essential for preventing "dry fire" conditions and ensuring the Smart System control board receives accurate resistance data. This immersion-style probe is engineered for durability within high-pressure hydronic environments, providing the reliable signaling required for modulating burners or electric heating elements to cycle efficiently. Maintaining this sensor is a standard procedure for protecting the heat exchanger from mineral buildup and ensuring the safety of the entire hydronic loop. When troubleshooting inconsistent water temperature or error codes related to high-limit differentials, replacing the lower probe with this Lochinvar genuine part is the industry-standard fix to restore system equilibrium and operational safety.

• Precise Thermal Feedback: Provides accurate temperature readings to the main control board to regulate heating cycles and improve system efficiency.
• OEM Compatibility: Seamlessly integrates with Lochinvar and A.O. Smith boilers and water heaters, ensuring exact fitment and resistance specs.
• System Protection: Helps prevent overheating and localized heat stress on the unit's internal tank and heat exchanger.
• Reliable Construction: Built to withstand the constant temperature fluctuations and chemical conditions typical of hydronic heating systems.

How do I verify if the 100110950 probe is faulty?
Technicians should perform a resistance check using a multimeter and compare the readings against the temperature-to-resistance chart in the manufacturer’s service manual. Inconsistent or "open" readings typically indicate sensor failure.

Where is this probe typically located in the system?
This specific part is designated as the lower probe, generally found near the bottom of the water heater tank or at the return inlet of the boiler to monitor the coolest water in the system.

What are the symptoms of a failing thermostat lower probe?
Common indicators include the system failing to reach setpoint temperatures, frequent short-cycling, or specific sensor-related fault codes appearing on the digital interface.

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.