Tempstar Hot Surface Igniter for T9MVX100L20A1 — OEM 1172533 HSI | Ships Today
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Overview
This is the OEM hot surface igniter (HSI), part number 1172533, for the Tempstar T9MVX100L20A1 two-stage variable-speed gas furnace. The hot surface igniter is the component that glows red-hot to ignite the gas at the burners on each heating call. It is one of the most common furnace wear items: the silicon-nitride/silicon-carbide element becomes brittle over time and eventually cracks or fails to reach ignition temperature, leaving you with no heat. Typical failure symptoms include the furnace clicking and the inducer running but no flame, a unit that locks out after several failed ignition attempts, or a visibly cracked or no-longer-glowing igniter. Replacing the HSI restores reliable ignition without an expensive service call.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1172533 |
| Type | Hot Surface Igniter (HSI) |
| Brand | Tempstar (ICP / Heil) |
| Fits Model | T9MVX100L20A1 |
| Function | Burner ignition |
| Related Component | Gas valve 1172822 (VR8205Q 2-stage) |
Compatibility
Direct-fit replacement for the Tempstar T9MVX100L20A1 100,000 BTU two-stage variable-speed furnace. This igniter is shared across the ICP/Tempstar/Heil/Comfortmaker family and is used in many 9MVX-series furnaces. Always confirm against your unit's parts list before ordering.
Installation Guide
- Safety First — Shut off gas and disconnect electrical power. Verify zero voltage with a multimeter before working.
- Access — Remove the lower furnace door to expose the burner assembly.
- Document — Photograph the igniter's mounting position and wire routing before disconnecting.
- Remove — Unplug the igniter wiring connector, remove the mounting screw, and carefully withdraw the old igniter without touching the new element with bare fingers.
- Install — Mount the new HSI in the same position, reconnect the wiring per your photo, and confirm correct alignment over the burner.
- Test — Restore gas and power, run a heat cycle, and confirm the igniter glows and the burners light promptly.
Signs You Need a Replacement
- Furnace runs the inducer and clicks but never ignites.
- Igniter no longer glows or glows weakly.
- Visible cracks or breaks in the igniter element.
- Furnace locks out after repeated failed ignition attempts.
Shipping & Returns
Ships same day on orders placed 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