provided the specific unit’s manual specifies part 100208390

Engineered with a rugged cast iron body

6 Cv equal percentage flow characteristic

and potential fire hazards

Nordyne 624689R Interface Module Freon provided the specific unit’s manualThe Nordyne 624689R Interface Module is a critical replacement component engineered for precise communication between the thermostat and the integrated furnace control board in specific Miller and Intertherm gas furnaces. This OEM interface board is designed to manage the ignition sequence and blower timing, ensuring the heating system operates within factory specifications. As a direct fit Nordyne replacement part, it addresses common diagnostic