Lochinvar & A.O. Smith 100167507 Control Board

The Lochinvar & A.O. Smith 100167507 Electronic Control Board is a critical integrated component designed for high-efficiency water heaters and boilers, including the Lochinvar Armor and Shield series. This OEM replacement part is technically identical to the legacy RLY1141 and serves as the primary combustion control module for managing ignition sequences, blower speeds, and temperature regulation. Engineered for TNR models, this printed circuit board (PCB) features dedicated slow-blow fuse protection (F1, F2, F3) for the 24V DC power supply, pump relays, and blower circuits to prevent catastrophic failure from electrical surges. Contractors should note that the 100167507 control module regulates the firing rate by precisely adjusting the ECM blower speed based on sensor feedback. When diagnosing no-hot-water or fault history codes, this board provides the necessary interface for troubleshooting HVAC systems, ensuring the gas valve and hot surface ignitor operate within strict safety parameters. Always verify the model and serial number before boiler control board installation to ensure total system compatibility.

• Universal Compatibility: Serves as a direct-fit OEM replacement for RLY1141, 100167507, and 100327054 across A.O. Smith and Lochinvar platforms.
• Advanced Diagnostics: Features an onboard fault history menu that logs the last nine events, allowing technicians to track flame sensor errors and ignition failures.
• Circuit Protection: Integrated slow-blow fuses protect internal electronic control pathways from common field issues like shorted circulating pumps.
• Precision Firing: Dynamically adjusts blower motor RPM to maintain optimal combustion air ratios for high-efficiency condensing operation.

• Does this board replace the RLY1141? Yes, the 100167507 is the current manufacturer-designated replacement for the discontinued RLY1141 with no modifications required for installation.
• What causes the fuses on this control board to blow? Typically, a leaking union above the circulating pump can short the electrical leads, causing the F1 (5 Amp) or F3 (.80 Amp) fuses to trip on the 100167507 board.
• How do I access the service mode? Technicians can enter the programming mode via the display interface using the installer password (5309) to adjust tank target temperatures and modulation parameters.

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.