Armstrong Furnace R43203-002 HSI Ignitor Technicians should de-energize the system

Technicians should de-energize the system and use a multimeter to check for a normally open state across the contacts

this is a sacrificial component

maintaining high moisture and acid capacity in both heating and cooling cycles

this restrictor orifice provides the exact technical specifications required for Nordyne and Miller units

The Single Pole Single Throw configuration ensures a clean break in the electrical circuit when temperatures rise above the open setpoint

Armstrong Furnace R43203-002 HSI Ignitor Technicians should de-energize the systemThe Armstrong Furnace R43203 002 HSI Ignitor is a critical OEM replacement component engineered for precision ignition in Armstrong Air and Lennox family gas furnaces. As a high performance hot surface ignitor (HSI), this part is designed to reach the specific ohm range and temperature necessary to ensure consistent pilot free furnace ignition without tripping flame sensors or causing delayed ignition sequences. This genuine Armstrong replacement part