Tempstar Hot Surface Igniter for T8MPN100F20B1 — HSI | Ships Today

Overview

This is the OEM hot surface igniter (HSI, part number 1172533) for the Tempstar T8MPN100F20B1 gas furnace. The hot surface igniter glows red-hot when the control board calls for heat, igniting the gas at the burners. It is a wear item — the igniter element becomes brittle over thousands of heating cycles and eventually cracks or burns open. When the igniter fails, the furnace blower and inducer may run normally but the burners never light, leaving you with no heat. A failing igniter often shows a weak or uneven glow, or no glow at all, before it stops working entirely.

Specifications

Compatibility

Engineered as a direct OEM replacement for the Tempstar T8MPN100F20B1 furnace. This igniter is used across a range of Tempstar, Heil, Comfortmaker, and ICP-built furnaces using the same hot surface ignition system. Confirm part number 1172533 and the igniter mounting style 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 and wire routing before disconnecting.
4. Remove — Unplug the igniter connector and remove the mounting screw. Handle the old igniter by its ceramic base only — never touch the element.
5. Install — Mount the new igniter, taking care not to touch the silicon-carbide element with bare fingers, and reconnect the wiring per your photo.
6. Test — Restore power and confirm the igniter glows and the burners light on a call for heat.

Signs You Need a Replacement

• Inducer and blower run but burners never ignite
• Igniter shows a weak, partial, or no glow
• Visible cracks or a broken element on the old igniter
• Furnace locks out and retries ignition repeatedly

Shipping & Returns

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