Tempstar Hot Surface Igniter for T8MPN100J20A1 — Silicon Nitride OEM 1009524 | Ships Today

Overview

This OEM hot surface igniter (part number 1009524, IGNITOR/SENSOR HSP SK) is the silicon-nitride ignition source for the Tempstar T8MPN100J20A1 gas furnace. When the thermostat calls for heat, the control board energizes the igniter, which glows white-hot to ignite the gas at the burners. A cracked, eroded, or open igniter is the single most common cause of furnace no-heat calls. This silicon-nitride style is more durable and faster-heating than legacy silicon-carbide elements, with a typical resistance reading in the 40–75 ohm range when good.

Specifications

Compatibility

Direct-fit replacement for the Tempstar T8MPN100J20A1 furnace and other ICP/Heil/Comfortmaker units that use the 1009524 silicon-nitride igniter assembly. Always confirm the part number on your existing igniter and mounting bracket before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, shut off the gas, and verify zero voltage with a multimeter.
2. Access — Remove the furnace burner-compartment service panel.
3. Document — Photograph the igniter position and wiring before disconnecting.
4. Remove — Unplug the igniter connector and remove the mounting screw; handle the old igniter by the ceramic base only — never touch the element.
5. Install — Mount the new igniter so the element sits correctly in the burner flame path, then reconnect the plug per your photo.
6. Test — Restore gas and power, run a heat cycle, and confirm the igniter glows and the burners light cleanly.

Signs You Need a Replacement

• Furnace blower runs but burners never light (no-heat).
• Igniter shows visible cracks, blistering, or hot spots.
• Open circuit / infinite resistance reading across the element.
• Intermittent ignition or repeated lockouts after several tries.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.