Lochinvar & A.O. Smith 100208497 Display Board

The Lochinvar & A.O. Smith 100208497 Display Board is a critical OEM interface component engineered for precise communication between the technician and the water heater or boiler control system. As a direct replacement for RLY2108 and RLY2108K, this digital display module is built to original factory specifications to ensure high-speed data transmission and accurate diagnostics. For contractors servicing Lochinvar Knight or A.O. Smith Cyclone series units, this board restores full visibility into error codes, temperature setpoints, and modulation status, preventing extended downtime due to interface failure. The genuine OEM 100208497 features a ruggedized PCB design to withstand the high-temperature environments typical of commercial and residential mechanical rooms, maintaining seamless integration with the main ignition control board.

Key Benefits for HVACR Technicians

• Universal Compatibility: Serves as the high-tier OEM replacement part for legacy numbers 100167689, RLY2108, and RLY2108K.
• Enhanced Diagnostics: Restores the ability to read real-time Smart System fault codes and sensor data for faster troubleshooting.
• Plug-and-Play Installation: Designed with standard pin-connector layouts for a secure, solder-free connection to the existing wiring harness.
• System Efficiency: Maintains accurate parameter settings, ensuring the condensing boiler or high-efficiency water heater operates at peak thermal performance.

Common Questions

Is the 100208497 compatible with older RLY2108 models?
Yes, this part is the current official replacement and provides full backwards compatibility with all systems previously utilizing the 100167689 or RLY2108 sequence.

What causes a "No Display" condition on Lochinvar boilers?
While a blank screen often indicates a failed 100208497 display board, technicians should first verify 120 VAC power to the unit and check the F2 and F3 fuses on the main control board before replacement.

Does this board require specialized software for setup?
No, this version is pre-loaded with the necessary firmware to communicate with the main control module immediately upon installation, though system-specific parameters may need to be re-entered via the keypad.

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.