Lochinvar & A.O. Smith 100208621 Harness

The Lochinvar & A.O. Smith 100208621 Spark Electrode Harness is a critical OEM replacement component designed for high-efficiency boiler ignition systems. Also identified by the industry cross-reference WRE2210K, this ignition harness provides a high-voltage path from the DSI control module to the spark electrode, facilitating reliable combustion across various condensing boiler and water heater models, including the Lochinvar KB150, 151, and 210/211 series. Engineered for HVACR durability, the harness features high-temperature insulation and precision connectors to prevent short-to-ground failures and intermittent ignition lockout. By maintaining a steady 10,000V+ delivery to the electrode gap, it ensures consistent fuel-to-air ignition and reduces carbon buildup on the firing rod. Replacing a fatigued or brittle WRE2210K harness is standard preventive maintenance for contractors diagnosing soft lockout codes or boiler ignition failure. This genuine OEM boiler part replaces legacy numbers 100173095 and WRE2210, ensuring full electrical compatibility with existing burner configurations and flame sensing circuits.

Key Benefits:

• OEM Compatibility: Specifically engineered for Lochinvar Knight and A.O. Smith commercial units, replacing 100208621 and WRE2210K accurately.
• Optimized Ignition: Delivers precise high-voltage current to the spark electrode for instant combustion under high-demand HVACR cycles.
• Durable Insulation: High-grade thermal casing protects the internal wire harness against heat-induced voltage leaks and moisture-driven shorts.
• System Reliability: Helps eliminate ignition lockout errors and inconsistent spark intervals in direct spark ignition (DSI) systems.

Common Questions:

• Will this harness fix a 'No Spark' condition? Yes, if the DSI module is outputting voltage but the current is leaking due to a cracked or brittle spark electrode harness, replacing it with the 100208621 will restore the circuit.
• Is the 100208621 identical to the WRE2210K? Absolutely. The 100208621 is the updated Part Number from A.O. Smith/Lochinvar and is functionally identical to the WRE2210K.
• Can I use this for the flame sensor instead? No, this is dedicated to the spark electrode; the flame sensor typically requires a separate flame sensor cable (such as 100208622) for signal rectification.

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.