Tempstar Hot Surface Igniter for T8DNL100L20A1 — OEM 1009524 | Ships Today

Overview

This is a genuine OEM hot surface igniter (part number 1009524, IGNITOR/SENSOR HSP SK) for the Tempstar T8DNL100L20A1 gas furnace. The hot surface igniter heats to a glowing temperature on each call for heat to light the burners, and it doubles as the flame-proving element on this platform. As the igniter ages it develops hairline cracks and high resistance, leading to delayed ignition, no ignition, or lockout after a few failed tries. Replacing a worn igniter is one of the most common no-heat fixes on these furnaces.

Specifications

Compatibility

Direct factory replacement for the Tempstar T8DNL100L20A1 furnace and used across many ICP-family furnaces sold under the Heil, Comfortmaker, and Tempstar brands. Match the connector and mounting bracket to your existing igniter before installing.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then 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 harness and unscrew the mounting bracket; handle the new igniter by the ceramic base only — never touch the silicon element.
5. Install — Mount the new igniter, set the correct gap to the burner, and reconnect the harness per your photo.
6. Test — Restore power and confirm the igniter glows and lights the burners on the next call for heat.

Signs You Need a Replacement

• No glow when the furnace calls for heat.
• Visible cracks or breaks in the igniter element.
• Furnace locks out after several failed ignition attempts.
• Delayed ignition with a noticeable gas smell or rollout.

Shipping & Returns

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