Trane Furnace Capacitor Parts

Trane Furnace Run Capacitor Parts

The run capacitor is one of the hardest-working parts in your Trane furnace — it stores and releases electrical energy to start the blower motor and inducer motor every heating cycle. When a capacitor fails, you'll notice the blower won't start, runs slowly, or hums but doesn't turn. A $15 to $40 OEM Trane capacitor is one of the quickest, most affordable furnace repairs.

Trane furnaces use dual-run capacitors (two capacitors in one housing) or single capacitors depending on the model. Match the microfarad (µF) rating and voltage exactly — these specs are printed on the old capacitor. Enter your Trane model number below to find the correct replacement capacitor for your furnace.

• Blower won't start: motor hums but no rotation; capacitor has lost capacitance
• Blower runs slowly: reduced torque; capacitor degrading; replace before it fails completely
• Inducer motor won't start: pressure switch trips immediately; inducer capacitor failed
• High-pitched hum: capacitor straining; imminent failure; replace now
• Burning smell near furnace: capacitor overheating; safety risk; disconnect power and replace immediately

Frequently Asked Questions: Trane Furnace Capacitor Replacement

Why is my Trane furnace blower not turning on, even though I hear humming?

A humming motor that won't turn is the classic sign of a failed run capacitor. The capacitor provides the initial electrical kick to start the motor. Without it, the motor has torque but no way to overcome inertia. Manually spinning the fan blade may make it run briefly, but the capacitor must be replaced to restore normal operation. This is one of the most common Trane furnace repairs and one of the easiest to fix.

How do I know if I need a dual-run capacitor or a single capacitor for my Trane furnace?

Check the nameplate on your existing capacitor — it will show the microfarad (µF) rating and voltage. Dual-run capacitors have two ratings stacked (e.g., 20/5 µF at 370V) and control both the blower and inducer motor. Single capacitors handle one motor. Your Trane model number determines which type you need. Use your model number in the search above to get the exact capacitor for your furnace.

Can I use an aftermarket capacitor, or does it have to be OEM Trane?

An OEM Trane capacitor is always the right choice. Aftermarket capacitors often use lower-quality dielectric materials and fail sooner than OEM parts. Capacitors that don't meet Trane's exact specifications can cause motor overheating and premature failure of the motor itself. For a $20 to $40 difference, OEM is a primary call.

What does the µF rating mean, and why does it matter?

Microfarads (µF) measure capacitance — the amount of electrical charge the capacitor can store. If you install a capacitor with the wrong µF rating, the motor will either underheat (too low) or overheat (too high). Both scenarios shorten motor life. The voltage rating (usually 370V or 440V) also must match or exceed the original. When in doubt, enter your Trane model number to get the exact specification.

Order Trane Furnace Capacitor Parts Online

Shop for Trane furnace capacitor parts online at Repair Clinic and enjoy hassle-free 365-day returns on any uninstalled products, supported by model-number lookup and return options. Whether you're replacing a single run, dual run, or high voltage capacitor, our price match guarantee ensures you get competitive pricing on genuine OEM parts. Easily find the exact capacitor you need by entering your Trane model number or part number in our search tool. Need help? Repair Clinic's online repair library provides the videos, guides, and diagrams you need for the repair. Plus, with same-day shipping on orders placed by 9 p.m., you can get your furnace running smoothly again in no time. Make sure to browse our extensive repair resources, from troubleshooting tips to maintenance videos, to support your DIY repair journey. Visit Repair Clinic's replacement parts page for more options.

Trane Furnace Model Number: Where to Look

On Trane furnaces, look for the model number on the blower compartment door or inside the front access panel. You may need to remove the panel to read the equipment rating plate, which also lists the serial number and other specifications. Copy the model number exactly, including letters and numbers, then type it into the model number lookup. The catalog will narrow to parts made for your complete furnace model, including the correct capacitor and other associated parts. Matching the full model instead of relying on appearance or a part description helps avoid compatibility mistakes. You order with confidence knowing the fit is right.