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Critical Safety Performance: Engineered as a furnace high limit protection device to interrupt the burner circuit if airflow is restricted or temperatures spike
from receiver tanks and filter housings
Smith Cyclone series and various Lochinvar KBX/WBX models
Always verify the part number on your existing module or the boiler's service manual before installation
Optimal Probe Depth: The 7-inch insert allows for deep-seated temperature monitoring in larger air handlers and furnaces
Nordyne 921378 Control Board 318518-761 Critical Safety Performance: Engineered asThe Nordyne 921378 Control Board is a critical OEM replacement designed to manage the ignition sequence and blower timing for specific Nordyne furnace and air handler models. As a veteran grade HVAC control board, it serves as the central hub for system logic, regulating the inducer motor, gas valve, and indoor blower to ensure precise HVAC system operation. This board replaces legacy part number 624786 and is engineered for high performance furnace
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