Lochinvar & A.O. Smith 100208515 Ignition Module

The Lochinvar & A.O. Smith 100208515 Ignition Module is a critical direct spark ignition (DSI) control engineered for high-recovery commercial water heaters and residential boilers. This 24V microprocessor-based controller manages the ignition sequence, flame supervision, and gas valve actuation with precision timing to ensure professional-grade combustion efficiency. Built to withstand high-ambient mechanical room conditions, this OEM replacement part is often utilized in Lochinvar Knight and A.O. Smith Cyclone series units where consistent flame sensing and trial-for-ignition cycles are required for safe operation. As a FENWAL-integrated component, it features on-board diagnostics with LED feedback, allowing technicians to rapidly identify ignition lockout or flame failure issues. This module regulates pre-purge timings and provides the high-voltage spark necessary for burner assemblies, making it a drop-in solution for restoring HVAC system reliability and reducing service downtime on gas-fired equipment.

Key Benefits

• Integrated Diagnostics: Features an LED status indicator for simplified troubleshooting of ignition trials and sensor faults.
• Precision Timing: Microprocessor control ensures exact pre-purge and trial-for-ignition (TFI) intervals for optimized fuel efficiency.
• Universal Compatibility: Serves as a direct OEM replacement for numerous Lochinvar and A.O. Smith commercial water heater models.
• Advanced Safety: Multi-try ignition sequencing and flame rectification technology prevent hazardous gas buildup during startup.

Common Questions

What does the LED flash code indicate on the 100208515?
The flashing LED provides specific fault codes corresponding to issues such as low flame signal, airflow switch failures, or internal control module errors. Always reference the ladder diagram on the appliance jacket for the specific code definitions.

Is this module compatible with both Natural Gas and Propane units?
Yes, the 100208515 ignition module is designed for gas-fired appliances using either fuel type, provided the gas valve and orifice assembly are correctly configured for the specific gas being used.

Can this replace a FENWAL 35-61 series control?
While this module is manufactured using FENWAL technology, it is programmed with specific OEM parameters for Lochinvar and A.O. Smith. It is recommended to use this exact part number to ensure compatibility with the unit's wiring harness and ignition timings.

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.