Tempstar Hot Surface Igniter/Sensor for T9MPV125L20A1 — Silicon Nitride HSI Kit | Ships Today

Overview

This is the OEM hot surface igniter and flame sensor service kit (part number 1009524, "IGNITOR/SENSOR HSP SK") for the Tempstar T9MPV125L20A1 gas furnace. The hot surface igniter (HSI) is the component that glows white-hot to ignite the burner gas on each heating cycle, while the integrated sensor confirms flame presence so the control board keeps the gas valve open. This silicon-nitride style HSI is more durable than older silicon-carbide igniters and resists the cracking and thermal fatigue that cause no-heat calls. When the igniter fails, the furnace will typically run its inducer and blower but never light, leaving you with cold air or a lockout fault.

Specifications

Compatibility

Engineered as a direct-fit replacement for the Tempstar T9MPV125L20A1 variable-speed gas furnace. Because Tempstar, ICP, Heil, Comfortmaker and other International Comfort Products brands share furnace platforms, this igniter/sensor kit also services many sibling models in the same family. Always verify your existing part number against 1009524 before installing.

Installation Guide

1. Safety First — Switch off the furnace at the disconnect and the breaker, then verify zero voltage at the control board with a multimeter. Shut off the gas supply.
2. Access — Remove the lower burner-compartment service panel.
3. Document — Photograph the igniter bracket, wire routing, and connector before disconnecting anything.
4. Remove — Unplug the igniter connector, remove the mounting screw(s), and carefully withdraw the old igniter from the burner assembly without touching the new element with bare fingers.
5. Install — Seat the new igniter/sensor at the correct depth in the burner port, secure the bracket, and reconnect the harness exactly as photographed.
6. Test — Restore gas and power, then run a heating cycle and confirm the igniter glows, the burner lights cleanly, and the flame holds without a flame-loss lockout.

Signs You Need a Replacement

• Furnace runs the inducer and blower but the burners never ignite (no heat).
• Visible cracks, white blistering, or breaks in the igniter element.
• Igniter does not glow, or glows weakly, during the ignition sequence.
• Control board flashes an ignition-failure or flame-sense lockout code.

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day hassle-free returns. Backed by the National HVAC Parts fitment guarantee.