Tempstar Hot Surface Igniter for TCK125N20B1 — Silicon Nitride | Ships Today

Overview

The genuine OEM hot surface igniter (part #1009524, IGNITOR/SENSOR HSP) for the Tempstar TCK125N20B1 gas furnace. This silicon nitride hot surface igniter glows to roughly 2,500°F to ignite the gas at the burners on each call for heat, and on this platform it also serves the flame-proving sensing function. Hot surface igniters are the single most common furnace heating failure: the brittle element cracks from thermal cycling, vibration, or being touched during service. A cracked igniter produces no glow, an open circuit, and a furnace that will not light.

Specifications

Compatibility

Built for the Tempstar TCK125N20B1 and used across many ICP-family furnaces (Tempstar, Heil, Comfortmaker, Arcoaire). Match the mounting bracket and connector to your existing igniter before installing.

Installation Guide

1. Safety First — Shut off gas and disconnect power at the switch and breaker; verify zero voltage with a multimeter.
2. Access — Remove the burner-compartment service panel.
3. Document — Photograph the igniter position, bracket, and wire routing before disconnecting.
4. Remove — Unplug the igniter connector, remove the mounting screw, and carefully lift out the old igniter, handling it only by the ceramic base — never the element.
5. Install — Set the new igniter in the exact factory position, secure the screw, and reconnect the plug. Do not touch the silicon nitride element with bare fingers.
6. Test — Restore gas and power, call for heat, and confirm the igniter glows and the burners light cleanly.

Signs You Need a Replacement

• Furnace tries to start but burners never light (no glow)
• Visible crack or break in the igniter element
• Open circuit / no continuity across the igniter
• Repeated ignition lockouts after several retries

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.