Lochinvar & A.O. Smith 100109929 Ignition Module

The Lochinvar & A.O. Smith 100109929 Ignition Module is a critical Honeywell Intermittent Pilot Ignition (IID) control designed for precise pilot gas flow management and spark ignition timing. Engineered for high-demand gas water heaters and HVAC systems, this direct replacement part (also identified as S8600M3001 or 9004544205) operates on a standard 24V 60Hz electrical loop. Field technicians rely on this module to ensure reliable flame sensing and safe startup sequences in commercial water heating applications. It is compatible with a wide range of high-efficiency models, including Lochinvar BTL 120-400 units and A.O. Smith BCG3 series. By replacing a faulty 100109929, contractors can restore the integrity of the intermittent pilot system, preventing common failure codes and ensuring consistent thermal performance. This OEM ignition control facilitates seamless integration with natural gas or propane gas burner configurations, maintaining the specific safety protocols required for industrial HVACR environments.

• Universal Intermittent Pilot Support: Engineered to manage both spark ignition and pilot gas valve operation across multiple Lochinvar and A.O. Smith commercial models.
• Precise Flame Sensing: Utilizes advanced circuitry for high-sensitivity flame rectification, reducing nuisance lockouts and improving system uptime.
• Rugged Component Design: Built to withstand the high-temperature conditions found in heavy-duty gas water heaters and boiler control cabinets.
• Broad Compatibility: Direct substitute for Honeywell S8600M3001, simplifying inventory for HVACR contractors servicing diverse boiler rooms.

Is the 100109929 ignition module compatible with both natural gas and propane?
Yes, this Honeywell IID control is designed to function with both natural gas and liquid propane (LP) configurations, provided the appropriate pilot burner assembly is utilized.

Can I use this module to replace an older 9004544205 ignition board?
Absolutely. Part number 100109929 is the current OEM replacement for the legacy 9004544205 and S8600M3001 modules found in many A.O. Smith and Lochinvar units.

What are the power requirements for this ignition control?
The module requires a 24VAC power supply and is rated for 60Hz operation, typical of standard commercial HVAC control circuits.

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.