Lochinvar & A.O. Smith 100167908 Module Kit

The Lochinvar & A.O. Smith 100167908 Module Kit is a critical OEM replacement ignition control designed for high-efficiency boiler and water heater systems. Effectively replacing the obsolete RLY3428, this 24V, 50/60Hz ignition module is engineered to manage the sequence of operation for Hot Surface Ignition (HSI) systems, specifically within CF/CH300-750 and CW/CB495-2065 series units. This kit ensures precise timing for trial-for-ignition, flame sensing, and lockout recovery, maintaining baseline safety and performance for commercial and residential hydronic applications. As a polarity-sensitive component, it integrates seamlessly with the CCB circuit board to resolve frequent flame failure lockout codes and intermittent ignition faults. For veteran contractors, this module provides the necessary microamp flame rectification stability required to prevent nuisance shutdowns in mid-to-large scale atmospheric and power-vented equipment.

• Exact OEM Match: Direct replacement for Lochinvar RLY3428, ensuring terminal-to-terminal compatibility without field modifications.
• Enhanced Troubleshooting: Supports modern diagnostic communication with Intelli-Vent and CCB systems to identify ignition failure versus gas valve faults.
• Robust Safety Timing: Optimized for precise pre-purge and post-purge cycles to ensure safe combustion air fan operation.
• System Consistency: Stabilizes flame sensing current to eliminate "flame fail running" errors common in older 24V ignition strings.

How do I verify if the 100167908 or the ignitor is causing the lockout?
Confirm that the ignitor is drawing at least 2.75 amps. If current draw is sufficient but the ignition control module fails to energize the gas valve after the warm-up period, the internal relay in the 100167908 is Likely pinned or scorched.

Is this module kit compatible with 120V ignition systems?
No, this is a 24V ignition module. Always verify transformer output (minimum 18VAC) and ground continuity before installation to prevent damaging the new 100167908 circuitry.

Can this kit resolve "AC Reversed" or polarity faults?
While the 100167908 is polarity sensitive, an "AC Reversed" fault is typically a wiring issue at the power supply. This module requires a proper earth ground to establish the flame rectification circuit.

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.