Lochinvar & A.O. Smith 100208465 Control Board

The Lochinvar & A.O. Smith 100208465 Control Board is a critical OEM replacement part designed for high-efficiency commercial water heaters and hydronic boilers. Engineered as a direct substitute for the RLY20001 and RLY20001K legacy boards, this integrated ignition control circuit manages vital system sequences, including flame rectification, temperature regulation, and draft inducer timing. It serves as the primary logic hub for monitoring pressure switch inputs and sensor data to ensure safe combustion and optimal energy consumption. This 120 VAC transformer compatible board features advanced onboard diagnostics with flash code LED indicators to streamline HVAC troubleshooting for field contractors. Its architecture is specifically calibrated for the SNR150-200 and SNA285 series, providing precise modulation control and rapid response to thermostat calls for heat. For professional technicians, utilizing this authentic Lochinvar circuit board is essential for maintaining system integrity and preventing the risk of nuisance lockouts in high-demand heating environments.

• Direct OEM Compatibility: Serves as the precise drop-in replacement for RLY20001 and RLY20001K units without requiring field modifications.
• Advanced System Diagnostics: Integrated LED error codes allow for rapid identification of ignition failure, limit switch trips, or sensor errors.
• Enhanced Operational Safety: Continuously monitors gas valve outputs and flame signals to ensure fail-safe operation during the ignition cycle.
• Precision Thermal Management: Accurately regulates water temperature and unit modulation to extend the service life of the heat exchanger.

Is the 100208465 compatible with older RLY20001 models? Yes, the 100208465 is the manufacturer-designated identical replacement for both RLY20001 and RLY20001K control boards.

What are the power requirements for this control board? This integrated control board operates on a 120 VAC, 50/60 Hz power supply and typically interfaces with a consistent 24V secondary circuit for internal logic and thermostat signals.

How do I resolve a 'No Display' or 'No Heat' condition? First, verify line voltage to the board and check the internal fuses (such as F3 or F5). If the board receives power but fails to initiate the draft inducer or signal the igniter, a logic failure may necessitate a replacement.

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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.