{"product_id":"tempstar-hot-surface-igniter-for-t8mpn125j20b2-120v-hsi-ships-today","title":"Tempstar Hot Surface Igniter for T8MPN125J20B2 — 120V HSI | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM hot surface igniter (HSI), part number 1172533, is the original ignition component for the Tempstar T8MPN125J20B2 gas furnace. The igniter receives 120V from the furnace control board during the heating call and glows white-hot to ignite the gas at the burners. It is one of the most common wear items in a modern furnace — the brittle silicon-carbide element degrades with every ignition cycle and eventually cracks or fails to reach temperature. When the igniter fails, the furnace blower may run but produce no heat, and the control board often locks out after several failed ignition attempts. Replacing the igniter with a genuine OEM unit restores reliable, on-demand ignition.\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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eGas Furnace Ignition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eEngineered as a direct-fit replacement for the Tempstar T8MPN125J20B2 furnace and shared-platform Heil, ICP, and Comfortmaker models that use the same ignition assembly. Always confirm your furnace's part number against 1172533 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 — Disconnect power at the furnace switch and breaker, shut off the gas, and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the lower service panel to expose the burner assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the igniter wiring and mounting bracket before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the igniter connector and remove the mounting screw. Handle the old igniter only by its ceramic base — never touch the element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new igniter so the element sits in the burner flame path without touching metal, then reconnect the plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore gas and power, then start a heat cycle and confirm the igniter glows and lights the burners cleanly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace blower runs but produces no heat\u003c\/li\u003e\n\u003cli\u003eIgniter does not glow, or glows dimly\/unevenly\u003c\/li\u003e\n\u003cli\u003eControl board locks out after repeated failed ignition attempts\u003c\/li\u003e\n\u003cli\u003eVisible cracks or chips in the igniter element\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":63021750354291,"sku":"1172533-GEN","price":26.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048453816691,"sku":"1172533","price":35.04,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-igniter-silicon-carbide-1172533_0f2f4552-c86a-4d04-afed-b6573f2cea68.jpg?v=1782960195","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-hot-surface-igniter-for-t8mpn125j20b2-120v-hsi-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}