Lochinvar & A.O. Smith 100208835 Thermostat Control

Maintain precise thermal regulation in high-demand heating systems with the Lochinvar & A.O. Smith 100208835 Thermostat Control. This professional-grade 2-stage thermostat is an OEM replacement designed to drop directly into Copper-Fin CB and CW series boilers (models 497–747) as well as various Lochinvar and A.O. Smith water heaters. Also recognized by part numbers TST2314 and TST2314K, this control is the verified successor to the discontinued 100318383. For technicians, this means a 1:1 fit with no field-drilling or wiring modifications required. It provides accurate staging for water heater temperature control, ensuring the heat exchanger fires efficiently according to load demand. Built for the rigors of mechanical rooms, the 100208835 ensures reliable setpoint maintenance, preventing rapid cycling and extending the operational life of the gas valve and ignition components.

Key Benefits:

• Direct OEM Compatibility: Verified replacement for TST2314, TST2314K, and 100318383, ensuring full logic integration with existing Lochinvar controls.
• Precise Staging: Features two-stage temperature management used specifically in Copper-Fin 987 to 2067 boilers and smaller CB/CW units.
• Rugged Industrial Build: Engineered to withstand the high-ambient conditions of commercial boiler rooms without calibration drift.
• Simplified Retrofitting: Standard mounting footprint and terminal layout allow for fast water heater repair and minimal system downtime.

Common Questions:

Is this part compatible with my specific Copper-Fin unit?
The 100208835 is the primary control for Lochinvar Copper-Fin models 497 through 747 and 987 through 2067. Always verify your specific model and serial number against the manufacturer’s parts list to ensure the correct staging logic.

Can I use this to resolve an "Error Code" or erratic firing?
If your system is short-cycling or failing to move between stages, a worn thermostat control board is a frequent culprit. This OEM part restores the factory-specified temperature differential and staging delays.

Does this kit include a new sensor?
Compatibility with existing NTC thermistors is standard; however, if the thermostat has failed due to an electrical surge, we recommend inspecting the water temperature sensor (part 100208552) during installation to ensure system-wide accuracy.

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.