Lochinvar & A.O. Smith 100110204 Control Module

When you're troubleshooting a Lochinvar Power-Fin or 120-series boiler that refuses to initiate its sequence, the Lochinvar & A.O. Smith 100110204 Control Module is usually the first place to look. As a genuine OEM IID control module, this board manages the critical intermittent ignition device (IID) logic, supervising everything from the prepurge cycle to flame proving. It is designed to handle 24VAC control circuits, integrating seamlessly with existing gas valves and pressure switches to ensure precise hot surface ignition timing. Unlike universal "will-fit" boards that can lead to flame failure lockouts or unstable 120VAC blower relay signals, this assembly maintains the factory ignition timing and spark strength required for high-efficiency hydronic systems. Whether you are performing a boiler control board replacement or a routine HVAC ignition module repair, this unit provides the proactive fault detection and 110VAC fan signaling necessary to keep commercial equipment running at peak performance without the risk of false fire triggers.

• OEM Precision: Genuine Lochinvar 100110204 part ensures exact pin-for-pin compatibility, eliminating field wiring errors common with generic alternatives.
• Advanced Sequencing: Manages the full ignition process, including prepurge, ignition trial, and continuous flame monitoring for maximum safety.
• System Protection: Features on-board fuse terminals to protect sensitive HVAC control module components from power surges and external shorts.
• Fault Diagnostics: Integrated logic assists in identifying boiler ignition issues, reducing troubleshooting time on-site for service technicians.

Common Questions

What are the symptoms of a failing 100110204 module?
Technicians often report ignition lockouts where the blower runs but the igniter never glows, or instances where the burner shuts down prematurely despite a solid call for heat. If your 120VAC to the fan is present but the gas valve isn't receiving 24VAC, it's a strong indicator the IID control module has failed.

Can I use a universal ignition module as a substitute?
It is strongly recommended to use this OEM part. General-purpose boards often lack the specific timing and flame proving microamp thresholds required by Lochinvar's secondary safety checks, leading to intermittent soft lockouts.

Is this part compatible with high-limit manual resets?
Yes, this module is engineered to work in series with the system's manual reset high-limit switches and air pressure sensors, ensuring that the ignition sequence only occurs when all safety parameters are met.

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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.