Lochinvar & A.O. Smith 100109887 Control Module

The Lochinvar & A.O. Smith 100109887 Control Module is a critical integrated ignition control designed for precise gas-fired water heater and boiler operation. This Fenwal 35-615922-113 equivalent manages direct spark ignition (DSI) sequences, flame sensing, and gas valve sequencing to ensure optimal combustion efficiency. Engineered for HVAC repair professionals, this 100109887 ignition board provides robust diagnostics through a dedicated LED interface, allowing for rapid troubleshooting of flame rectification issues. As a primary OEM replacement part, it handles microprocessor-based timing for prepurge, interpurge, and trial-for-ignition periods. This module is compatible with various high-recovery commercial units, maintaining the stringent safety tolerances required for industrial water heater maintenance. Integrating this digital ignition control ensures seamless communication between the thermostat and the burner assembly, preventing nuisance lockouts and maintaining system pressure and temperature setpoints in demanding commercial environments.

Key Benefits

• Standardized DSI Logic: Utilizes 120V input to manage high-voltage spark generation and flame sensing.
• System Diagnostics: Integrated LED flash codes simplify the identification of airflow, limit switch, or flame failure errors.
• Direct Compatibility: Drop-in replacement for Lochinvar 100109887 and A.O. Smith 100109887 commercial water heater models.
• Hardened Circuitry: Designed to withstand the high-temperature conditions found in commercial boiler cabinets.

Common Questions

What causes a lockout on the 100109887 module?
Lockouts often stem from insufficient flame rectification signals, faulty grounding, or restricted gas pressure. Check the microamp signal at the flame rod to ensure it meets the minimum threshold specified for this control board.

Can this board replace non-OEM Fenwal modules?
While several modules look similar, the 100109887 features specific timing sequences (prepurge and trial-for-ignition) calibrated for Lochinvar and A.O. Smith burner profiles. Always match the specific OEM part number to ensure safe operation.

Is the LED diagnostic light included?
Yes, the board features an onboard status LED that provides real-time feedback on the ignition sequence and fault codes for technical troubleshooting.

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.