Tempstar Hot Surface Igniter for T8DNL050B12B2 – HSI Furnace Ignitor | Ships Today
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Overview
This genuine OEM hot surface igniter (HSI, part #1172533) for the Tempstar T8DNL050B12B2 gas furnace is the component that glows red-hot to ignite the burners on each heat call. The control board sends 120V to the igniter, it heats to ignition temperature, and the gas valve opens to light the gas. A cracked, broken, or aged igniter is the single most common reason a furnace clicks and tries to start but never produces heat. This igniter works in concert with the OEM gas valve (Honeywell VR8205S, part #1175705) used on this model; the valve only opens once the ignition and safety sequence is satisfied. Replacing an HSI proactively before peak heating season prevents a no-heat callout on the coldest night.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172533 (HSI Ignitor) |
| Associated Valve | 1175705 – Honeywell VR8205S Gas Valve |
| Type | Hot Surface Igniter |
| Brand | Tempstar (ICP / Heil) |
| Operating Voltage | 120V |
| Fitment | OEM Replacement |
Compatibility
Fits the Tempstar T8DNL050B12B2 gas furnace and other ICP-family models (Heil, Comfortmaker, Arcoaire) using this hot surface ignition system with the VR8205S gas valve. Match the igniter mounting bracket and plug to your existing part before ordering.
Installation Guide
- Safety First – Disconnect power at the breaker and shut off the gas; verify zero voltage with a multimeter.
- Access – Remove the burner compartment door to reach the igniter at the burner assembly.
- Document – Photograph the igniter plug, bracket position, and gap to the burner.
- Remove – Unplug the igniter connector, remove the mounting screw, and withdraw the old igniter without touching the silicon element.
- Install – Mount the new HSI, handling it only by the ceramic base, and reconnect the plug.
- Test – Restore gas and power, then watch a full ignition cycle to confirm the igniter glows and the burners light.
Signs You Need a Replacement
- Furnace tries to start but never lights the burners
- Visible crack or break in the silicon nitride element
- Igniter no longer glows on a heat call
- Repeated lockouts after several failed ignition attempts
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days