Lochinvar 100361277 High Altitude Main Control Board for NKC/NCF199 Noble Fire Tube Boiler

The Lochinvar 100361277 is an OEM replacement Main Control Board designed for High Altitude operation, compatible with the Lochinvar Noble Fire Tube NKC199 and NCF199 combination boiler/water heater models. This is a direct factory replacement part engineered to restore full system functionality in installations located at elevated altitudes where standard control boards are not rated.

As the central processing component of the heating system, the main control board manages and coordinates all critical boiler functions. It receives and interprets input signals from the system's sensors and switches—including inlet, outlet, flue, and flow sensors—and uses that data to precisely regulate burner firing, heat output, and fan speed. The high-altitude variant is specifically calibrated to account for reduced air density at elevation, ensuring safe and efficient combustion performance.

Key Features:

• OEM Lochinvar replacement part — exact fit for NKC199 and NCF199 Noble Fire Tube models
• High-altitude rated main control board for installations at elevated elevations
• Manages burner operation, fan speed, and heat output regulation
• Interprets signals from inlet, outlet, flue, and flow sensors
• Built-in diagnostic capabilities for identifying system faults and facilitating efficient service
• Direct plug-and-play replacement — no modification required
• Manufactured to Lochinvar OEM specifications for reliable, long-term performance

This control board is referenced in Lochinvar's official Noble Boiler parts documentation (part position 3) and is the correct high-altitude board for the NKC/NCF199 platform. It is an essential component for HVAC technicians servicing Lochinvar Noble series equipment in mountain or high-elevation installations.