{"product_id":"tempstar-hot-surface-igniter-for-t8mpv125j20b1-hsi-furnace-ignitor-ships-today","title":"Tempstar Hot Surface Igniter for T8MPV125J20B1 — HSI Furnace Ignitor | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM hot surface igniter (HSI, part number 1172533) is the ignition source for the Tempstar T8MPV125J20B1 two-stage gas furnace. On a call for heat the control board energizes the igniter; it glows to roughly 1,800–2,500°F and ignites the gas as it leaves the burners. This model uses the igniter together with the OEM gas valve (1172822, VR8205Q two-stage hot-surface valve) to deliver staged heating. Igniters are the most common furnace failure point: the brittle silicon-carbide element cracks from thermal cycling, contamination, or rough handling. A cracked or open igniter produces no glow, leaving the furnace to lock out after several failed trials for 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 (HSI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompanion Part\u003c\/td\u003e\n\u003ctd\u003e1172822 — Gas Valve, 2-Stage HW VR8205Q\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eHot Surface Igniter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP \/ Heil)\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\u003eStages\u003c\/td\u003e\n\u003ctd\u003e2-Stage Heat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eBuilt for the Tempstar T8MPV125J20B1 furnace and shared across ICP-family two-stage furnaces (Heil, Comfortmaker, Arcoaire, KeepRite). Verify the igniter part number and connector style against your existing unit 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 and verify zero voltage with a multimeter before touching wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the burner-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the igniter mounting and the wire harness routing before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the igniter connector and remove the mounting screw(s); handle the old igniter by its ceramic base only, never the element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new igniter so the element sits correctly in the burner flame path, never touching it with bare fingers, then reconnect the harness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm the igniter glows and the burners light cleanly on a call for heat.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIgniter does not glow on a heat call\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after repeated ignition attempts\u003c\/li\u003e\n\u003cli\u003eVisible crack, blistering, or breakage in the element\u003c\/li\u003e\n\u003cli\u003eOpen circuit \/ no continuity when checked with a meter\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":63021687177587,"sku":"1172533-GEN","price":39.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048455029107,"sku":"1172533","price":50.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-igniter-silicon-carbide-1172533_c71d1e2a-6e19-4b56-8d69-4db00778f468.jpg?v=1782960240","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-hot-surface-igniter-for-t8mpv125j20b1-hsi-furnace-ignitor-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}