Tempstar Hot Surface Igniter for T8MPL050B12B1 — HSI | Ships Today
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Overview
This OEM hot surface igniter (HSI, part #1172533) is the ignition source for your Tempstar T8MPL050B12B1 gas furnace. On each call for heat the control board sends voltage to the igniter, which glows red-hot and lights the gas as it flows from the valve. HSI elements are brittle and degrade with every thermal cycle, so they are one of the most common no-heat failure points. Symptoms of a failing igniter include a furnace that clicks and cycles but never lights, a weak or no glow at the igniter, repeated lockouts after several failed ignition attempts, or visible cracks and white-spotted scaling on the element. This listing references the OEM HSI (1172533); the related gas valve assembly (1172821, VR8205S snap-mount) is documented for the same model so you can confirm a complete ignition-circuit repair.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172533 |
| Type | Hot Surface Igniter (HSI) |
| Brand | Tempstar (ICP / Heil) |
| Related Part | 1172821 Gas Valve (VR8205S) |
| Fit | OEM Direct Replacement |
| Application | Gas Furnace Ignition |
Compatibility
Direct-fit replacement for the Tempstar T8MPL050B12B1 furnace and other ICP-family models (Heil, Comfortmaker, Arcoaire) using igniter 1172533. Verify the igniter mounting style and connector match your existing unit before installing.
Installation Guide
- Safety First — Shut off the gas, disconnect power at the switch and breaker, and verify zero voltage with a multimeter.
- Access — Remove the burner compartment service panel.
- Document — Photograph the igniter position, bracket, and wiring connector before disconnecting.
- Remove — Unplug the igniter lead and remove the mounting screw; handle the old element by its ceramic base only.
- Install — Mount the new HSI — never touch the silicon-nitride/carbide element with bare fingers — and reconnect the lead per your photo.
- Test — Restore gas and power, then watch a full ignition cycle to confirm a strong glow and clean light-off.
Signs You Need a Replacement
- Furnace cycles and clicks but never ignites
- Weak glow or no glow at the igniter
- Repeated ignition lockouts after multiple attempts
- Visible cracks, blistering, or white scaling on the element
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days