626421R Nordyne Hot Surface Ignition (HSI) Control Module

Product Overview

626421R is a genuine OEM Nordyne hot surface ignition control board offering 120/240 VAC line-voltage switching for HSI elements, 24 VAC control inputs up to 250 mA, and integrated flame sensing with LED diagnostics. Backed by a 1-year warranty, it replaces legacy Nordyne and Miller HSI modules and ensures reliable ignition sequencing and lock-out protection in gas furnaces. 2