768A-815 – HOT SURFACE IGNITOR (80V, TRANE, IGN00145)

If your furnace won’t light or only clicks without igniting, the hot surface ignitor is usually the fix. This 80V silicon nitride ignitor is a direct replacement for Trane furnaces using IGN00145 or IGN00117. Note: this is 80V, not 120V — check your furnace specs before buying.

Replaces: IGN00117, IGN00145, IGN0117, IGN0145, IGN117, IGN145, SSN0145, 768A-815, A341947P01, B340971, B340971P01

Fits: Trane: TUD100C945K2 and other Trane/American Standard 80V furnaces.

Need help? See our Furnace Not Heating Guide.

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• StyleHot surface ignitor (HSI)
• ElementSilicon carbide
• Voltage80V
• ConnectorVerify with existing part
• MountBracket style
• FitsTrane-compatible

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 768A-815
• A341947P01
• B340971
• B340971P01
• IGN00117
• IGN0117
• IGN0145
• IGN117
• IGN145
• SSN0145
• TUD100C945K2

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• 80V hot-surface-ignition gas furnaces (most 80%+ AFUE units from 1990s onward)
• Verify voltage rating matches your existing HSI — installing the wrong voltage will burn the new one out instantly
• Bracket and connector geometry vary by OEM — bring the old part in to match

How do I test a hot surface ignitor?

Pull it out, check resistance with a multimeter across the leads. Healthy HSIs read roughly 40-90 ohms (80V) or 40-200 ohms (120V). Open circuit = dead. Bring it to the counter — we test these free.

Why does my new HSI keep failing?

HSIs fail from cycle stress and contamination. Common causes: dirty filter (overheats furnace, short-cycles), dirty flame sensor (forces re-light attempts), oversized furnace, or skin oils on the ceramic element. Fix the root cause when you replace.

How long should an HSI last?

3-7 years typical. Short-cycling burns through HSIs fast — address what's causing the short-cycling, not just the burned ignitor.