{"product_id":"tempstar-hot-surface-igniter-for-t8dnl100l20b1-furnace-hsi-ships-today","title":"Tempstar Hot Surface Igniter for T8DNL100L20B1 — 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 T8DNL100L20B1 gas furnace. On every call for heat the control board energizes the igniter, which glows red-hot to light the gas as it leaves the valve. Because the ceramic element is brittle and weakens with each heat cycle, the HSI is one of the most commonly replaced furnace parts. When it cracks or can no longer reach ignition temperature, the furnace runs its ignition sequence, fails to light, and locks out — leaving you without heat. This listing covers the OEM igniter; the matched gas valve assembly (1172821, VR8205S snap-mount) is referenced for technicians servicing the complete 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\u003e1172821 (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 T8DNL100L20B1 furnace and shared across ICP-family models (Heil, Comfortmaker, Arcoaire) using the same HSI mounting bracket 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 burners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the igniter position and harness routing before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the connector and remove the mounting screw, handling the igniter by its 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 for 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 runs the ignition sequence but never lights.\u003c\/li\u003e\n\u003cli\u003eIgniter does not glow or glows dim and uneven.\u003c\/li\u003e\n\u003cli\u003eVisible cracks, chips, or blistered spots on the element.\u003c\/li\u003e\n\u003cli\u003eRepeated ignition lockouts after multiple failed attempts.\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":63021778010483,"sku":"1172533-GEN","price":36.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048451850611,"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_6d541363-0549-45ec-9f2e-5081e9667a7f.jpg?v=1782960116","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-hot-surface-igniter-for-t8dnl100l20b1-furnace-hsi-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}