Lochinvar & A.O. Smith 100208460 Ignition Module

The Lochinvar & A.O. Smith 100208460 Ignition Module is a critical direct-interface component for managing intermittent pilot ignition sequences in commercial and residential water heaters. Engineers and field techs recognize this universal ignition control as the primary replacement for the legacy RLY2023 and RLY2023K units. Operating on a 24VAC 50/60Hz power supply with a 150mA current draw, this microprocessor-based ignition provides a steady spark output and precise microamp flame sensing to ensure safe gas valve actuation and flame rectification. Built by UT Electronic Controls (UTEC), the 100208460 offers a reliable spark-to-pilot sequence, preventing the hazardous accumulation of unburned gas by strictly monitoring the pilot flame before opening the main burner. Whether you are troubleshooting ignition failure on a Lochinvar Copper-Fin or an A.O. Smith Cyclone model, this OEM replacement part ensures the system remains within factory-specified combustion timing and safety parameters.

• Drop-in Compatibility: 100208460 is the exact 1:1 identical replacement for part number RLY2023, eliminating the need for mounting modifications.
• Advanced Diagnostics: Equipped with an integrated Status LED to provide real-time flash codes for rapid troubleshooting of lockout conditions or internal faults.
• Intermittent Pilot Control: Efficiently manages the spark-and-sense cycle to reduce energy consumption by keeping the pilot off when there is no call for heat.
• Durable Construction: Engineered to withstand the high ambient temperatures found in HVACR burner compartments.

Is the 100208460 compatible with older RLY2023 systems?
Yes, the 100208460 is the current manufacturer-designated replacement for the RLY2023 and RLY2023K. Wiring harnesses and terminal positions are standard across these iterations to maintain field-service compatibility.

What causes an ignition module lockout on A.O. Smith units?
Lockouts typically occur due to low 24VAC supply, poor grounding, or a failure to sense the flame rectification signal. If the ignition module does not detect a consistent microamp signal from the flame rod, it will initiate a safety shutdown of the gas valve.

How do I test the spark output on this module?
Verify that 24VAC is present at the module's power terminals during the call for heat. If power is present but the spark igniter fails to fire, check for cracked porcelain on the igniter or loose high-voltage leads before replacing the module.

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.