Tempstar Hot Surface Igniter for T9MPV125L20C1 — Silicon Nitride HSI | Ships Today
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Overview
This OEM hot surface igniter (HSI), part number 1172533, is the direct-fire ignition component for the Tempstar T9MPV125L20C1 two-stage gas furnace. On each heat call the furnace control energizes the igniter, which heats to roughly 1,800–2,500°F and lights the burners. Hot surface igniters are the most common failure point in modern furnaces because the brittle silicon-nitride element degrades with every thermal cycle and from handling. Typical failure symptoms include the furnace blower running with no heat, a clicking gas valve that never lights, a glowing igniter that cracks, or a hard lockout after several failed ignition attempts.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172533 (IGNITOR HSI) |
| Type | Hot Surface Igniter (silicon nitride) |
| Brand | Tempstar / ICP / Heil |
| Voltage | 120V |
| Application | Two-stage gas furnace ignition |
| Fitment | OEM direct replacement |
Compatibility
Engineered for the Tempstar T9MPV125L20C1 9-series two-stage variable-speed gas furnace and shared across the ICP / Heil / Comfortmaker family that uses the 1172533 igniter. Always confirm the part number on your existing igniter before ordering.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, shut off the gas, and verify zero voltage with a multimeter.
- Access — Remove the burner-compartment service panel.
- Document — Photograph the igniter bracket, wiring, and connector before disconnecting.
- Remove — Unplug the igniter harness, remove the mounting screw, and lift the old igniter out without touching the ceramic element.
- Install — Seat the new igniter in the bracket, handling it only by the ceramic base, secure the screw, and reconnect the harness.
- Test — Restore gas and power, then watch a full ignition cycle to confirm the igniter glows and the burners light.
Signs You Need a Replacement
- Furnace blower runs but produces no heat.
- Igniter shows visible cracks or no longer glows.
- Repeated ignition attempts ending in control-board lockout.
- Burners fail to light despite an open gas valve.
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