{"product_id":"tempstar-hot-surface-igniter-for-t8dnl100l20b2-furnace-hsi-ships-today","title":"Tempstar Hot Surface Igniter for T8DNL100L20B2 — Furnace HSI | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM hot surface igniter (HSI, part number 1172533) for the Tempstar T8DNL100L20B2 gas furnace. On each call for heat the control board energizes the igniter, which glows red-hot to ignite the gas as it flows from the valve. The igniter is one of the most replaced furnace parts because the silicon-nitride\/silicon-carbide element is brittle and degrades with every heat cycle. When it cracks or fails to reach ignition temperature, the furnace will go through its ignition sequence, fail to light, and lock out — leaving you with no heat and an error code on the board. This listing covers the OEM igniter; the matched gas valve assembly (1175705, VR8205S snap-mount) is referenced for service technicians diagnosing the full ignition chain.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1172533\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eHot Surface Igniter (HSI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e120V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelated Gas Valve\u003c\/td\u003e\n\u003ctd\u003e1175705 (VR8205S Snap-Mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eGas Furnace Ignition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect-fit replacement for the Tempstar T8DNL100L20B2 furnace and shared across ICP-family models (Heil, Comfortmaker, Arcoaire) using the same HSI mounting and connector. Verify the connector style and bracket against your existing igniter before installing.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Shut off gas and power at the furnace, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the burner compartment door to expose the igniter and burner assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the igniter mounting position and wire harness routing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the igniter connector and remove the mounting screw. Handle by the ceramic base only — never touch the element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new igniter at the correct depth and angle, secure the screw, and reconnect the harness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore gas and power, then watch a full ignition cycle to confirm a clean light and stable flame.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace clicks and runs the sequence but never lights.\u003c\/li\u003e\n\u003cli\u003eIgniter does not glow, or glows dim\/uneven.\u003c\/li\u003e\n\u003cli\u003eVisible cracks, chips, or white\/blistered spots on the element.\u003c\/li\u003e\n\u003cli\u003eRepeated ignition lockouts after three failed tries.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021777944947,"sku":"1172533-GEN","price":36.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048451916147,"sku":"1172533","price":48.04,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-igniter-silicon-carbide-1172533_aef90c37-66e7-4b4d-82b6-31ace51c4d56.jpg?v=1782960118","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-hot-surface-igniter-for-t8dnl100l20b2-furnace-hsi-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}