Lochinvar & A.O. Smith 100208555 Temperature Board

The Lochinvar & A.O. Smith 100208555 Temperature Board is a critical OEM 2-stage thermostat control designed for precision thermal regulation in high-efficiency commercial and residential water heating systems. As the direct replacement for TST5314, TST5314K, and 100170659, this board maintains system communication between the user interface and the firing controls to ensure accurate set-point management. Engineered for durability, this HVAC control board processes real-time data from temperature sensors to modulate heating cycles, preventing overheating and ensuring the unit operates within peak efficiency parameters. For technicians performing a boiler part replacement, this board is a drop-in solution for Lochinvar CWN399PM and CWN500PM models, among others. By restoring proper logic for two-stage operation, it eliminates common water heater troubleshooting issues such as inconsistent water temperatures or high-limit trips. Relying on genuine Lochinvar parts ensures seamless electrical compatibility and long-term reliability for demanding hydronic applications.

• Direct OEM Replacement: Seamlessly replaces discontinued part numbers TST5314 and TST5314K without requiring field modifications.
• 2-Stage Control Logic: Tailored for Multi-Stack and high-input systems, facilitating precise two-stage temperature control for better energy management.
• Enhanced System Safety: Monitors sensor feedback to prevent thermal runaway, a critical feature for high-demand A.O. Smith water heaters.
• Plug-and-Play Integration: Standardized socket connectors allow for fast installation during emergency commercial HVAC service calls.

What models are compatible with the 100208555 board?
This board is primarily utilized in Lochinvar Copper-Fin and Power-Fin series, specifically matching models like the CWN399PM and CWN500PM. Always verify the part number in your specific unit's manual.

Will this fix an "Overheating" or "High Limit" error?
If the existing temperature control board has failed or is misreading sensor resistance, installing this OEM replacement can resolve 120V logic errors that lead to frequent safety shutdowns.

Is this a genuine Lochinvar/A.O. Smith part?
Yes, this is an authentic OEM replacement part, ensuring the electrical specs and firmware match the original factory requirements for your heating equipment.

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.