{"product_id":"icp-hot-surface-igniter-for-x8mpt125j20a1-two-stage-furnace-oem-hsi-ships-today-1","title":"ICP Hot Surface Igniter for X8MPT125J20A1 Two-Stage Furnace — OEM HSI | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe hot surface igniter (OEM #1172533) is the heart of the ignition system on your ICP \/ Tempstar \/ Heil X8MPT125J20A1 two-stage gas furnace. When the thermostat calls for heat, the control board energizes this igniter; it glows red-hot (roughly 1,800–2,500°F) and ignites the gas as it flows from the valve. This is the single most common furnace failure point — the silicon-carbide or silicon-nitride element is brittle and degrades with every heating cycle. Typical failure symptoms include a furnace that clicks and tries to start but never lights, no glow visible through the inspection port, repeated lockouts with the LED flashing an ignition-failure code, or cold air blowing because the burners never fire. This OEM HSI is a direct-fit replacement rated for 120V operation and matched to the X8MPT ignition sequence.\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\u003ePrimary Part Number\u003c\/td\u003e\n\u003ctd\u003e1172533 (IGNITOR HSI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompanion Parts\u003c\/td\u003e\n\u003ctd\u003e1172543 (Flame Sensor HSI), 1172542 (2-Stage Gas Valve, HW VR8205Q)\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\u003eICP \/ Tempstar \/ Heil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eTwo-stage gas furnace ignition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM direct 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 for the ICP-family X8MPT125J20A1 two-stage variable-speed gas furnace and shared across the Tempstar, Heil, Comfortmaker, and Day \u0026amp; Night badge-engineered equivalents that use the same burner assembly. Always confirm the part number on your existing igniter and the model\/serial tag inside the furnace blower compartment before ordering.\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 the gas at the supply valve and disconnect electrical power at the breaker. Verify zero voltage with a multimeter at the furnace control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the lower burner-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the igniter bracket position and the two-wire ignition harness before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the igniter connector, remove the mounting screw, and carefully withdraw the old igniter without touching the element. Note the exact insertion depth and angle relative to the burner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Handle the new igniter only by its ceramic base (skin oils crack the element), seat it at the same depth\/angle, secure the screw, and reconnect the harness per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore gas and power, initiate a heat call, and watch a full cycle to confirm the igniter glows, the burners light, and the flame sensor proves flame without lockout.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace attempts ignition (you hear the inducer and gas valve click) but never lights.\u003c\/li\u003e\n\u003cli\u003eNo orange glow visible through the burner sight port during a heat call.\u003c\/li\u003e\n\u003cli\u003eVisible cracks, blisters, or white spots on the igniter element.\u003c\/li\u003e\n\u003cli\u003eRepeated ignition-failure lockouts after three retries with the control LED flashing a fault code.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day on orders placed before 3 PM CST. 30-day returns on unused parts. Backed by the National HVAC Parts fitment guarantee — if it doesn't fit your X8MPT125J20A1, we make it right.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"OEM","offer_id":63027200229747,"sku":"1172533","price":49.4,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047679476083,"sku":"1172533-GEN","price":38.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-igniter-silicon-carbide-1172533_72ca6c0d-6177-4d48-9185-e2aad4a10497.jpg?v=1782893413","url":"https:\/\/nationalhvacparts.com\/products\/icp-hot-surface-igniter-for-x8mpt125j20a1-two-stage-furnace-oem-hsi-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}