Tempstar Hot Surface Igniter/Sensor for T8MPL125J20A1 — HSP Silicon Nitride | Ships Today

Overview

This OEM hot surface igniter/sensor (part #1009524, HSP silicon-nitride type) lights the burners on your Tempstar T8MPL125J20A1 furnace and confirms flame presence. On a heat call the control board energizes the element until it glows hot enough to ignite gas; the same assembly helps verify the burner has lit. HSP silicon-nitride igniters are more rugged than older silicon-carbide elements but still fail from thermal cycling, cracking, or contamination. Telltale symptoms are the blower running with no heat, repeated ignition lockouts, a clicking gas valve that never lights, or a glow that is weak or absent.

Specifications

Compatibility

Direct OEM fit for the Tempstar T8MPL125J20A1 gas furnace and ICP-family equipment (Heil, Comfortmaker, Arcoaire, Keeprite) that specifies igniter/sensor 1009524. Confirm your existing igniter part number and connector style before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker and confirm zero voltage with a multimeter.
2. Access — Remove the burner-compartment access panel.
3. Document — Photograph the igniter mounting position and wiring connector before disconnecting.
4. Remove — Unplug the harness, remove the mounting screw(s), and carefully lift out the fragile element — never touch the new element with bare fingers.
5. Install — Mount the new igniter/sensor in the same orientation, reconnect the harness, and confirm proper alignment over the burner.
6. Test — Restore power, start a heat call, and confirm the element glows and the burners light promptly.

Signs You Need a Replacement

• Blower runs but no heat is produced
• Igniter does not glow or glows dim/uneven
• Furnace locks out after repeated failed ignition attempts
• Visible crack or break in the igniter element

Shipping & Returns

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