Lochinvar & A.O. Smith 100208501 Connection Board

As a seasoned technician, you know that a reliable low-voltage control interface is the backbone of any first-generation Lochinvar Knight boiler or A.O. Smith commercial water heater. The Lochinvar & A.O. Smith 100208501 Connection Board serves as the centralized wiring hub for vital field-installed components. This genuine OEM board is a direct, pin-to-pin replacement for the Lochinvar RLY2202, ensuring seamless integration without the need for field modifications or hacking into the harness. It provides dedicated 24VAC terminals for thermostats, external limits, gas pressure switches, and low water cutoffs (LWCO).

When diagnosing intermittent lockout codes or "Gas Pressure SW" open errors, this board is often the primary suspect for signal loss. The 100208501 HVAC control board is engineered to withstand the thermal stresses of a mechanical room while maintaining precise continuity for safety interlocks. By utilizing this exact A.O. Smith replacement part, you ensure the internal logic of the Lochinvar boiler control system remains intact. This is the professional’s choice for restoring system communication in KBN series boilers from 80,000 to 800,000 BTU/hr models.

• Universal Compatibility: Serves as the identical OEM replacement for part number RLY2202, covering a wide range of Lochinvar and A.O. Smith hydronic equipment.
• Simplified Wiring: Organized terminal blocks allow for clean, identifiable connections for external pumps and safety sensors.
• Enhanced Troubleshooting: Provides a clear point of access for testing 24V signals to isolate issues between the main controller and field devices.
• Built for Durability: Industrial-grade PCB construction designed specifically for high-efficiency condensing boiler applications.

• Is the 100208501 interchangeable with the RLY2202? Yes, the 100208501 is the current manufacturer part number and is functionally identical to the legacy RLY2202 board.
• Which boiler models use this connection board? This board is predominantly used in first-generation Lochinvar Knight (KBN) boilers and associated A.O. Smith water heaters.
• What happens if the jumpers on this board are missing? Missing or loose jumpers on the LVCB can trigger immediate safety faults, such as open gas pressure switch or flow switch error codes.

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.