Armstrong Furnace R43203-002 HSI Ignitor this is a sacrificial component

this is a sacrificial component

making it ideal for older 4-wire systems where a common wire is unavailable

reducing system downtime and labor costs

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 this is a sacrificial componentThe 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