Bathroom Exhaust Fan Not Running or Too Noisy? Motor Assembly S10940056 — Fix Failed Fan Fast
A bathroom exhaust fan that hums but won't spin, runs at reduced speed, or has stopped entirely is almost always a failed motor and blade assembly. In most Broan and NuTone 675-series fans, this is caused by a worn-out motor winding or seized bearing in the fan motor. When it fails, the fan stops moving air, humidity builds up, and mould risk increases immediately. ⚡ Common failure point in Broan-built 675-series exhaust fans — especially in units over 5 years old. Part S10940056 is the genuine OEM replacement that restores full 70 CFM airflow and quiet operation without replacing the entire housing.
❓ Is This the Right Part?
This is the correct fix if ALL of the following are true:
- ✔ Your fan housing is a Broan 675, NuTone 675, Broan F675, or NuTone F675 (or H600-series housing)
- ✔ The fan light (if equipped) and electrical supply are working normally
- ✔ Power to the fan is confirmed — switch works, breaker is on
- ✔ The grille and housing are intact — only the motor/blade has failed
- ✔ ONLY problem is the fan not spinning, humming without moving air, or excessive noise
Not sure? Send us your model number — we'll confirm before you order.
🔧 Common Symptoms
- Exhaust fan hums but blade doesn't spin — most common complaint
- Fan runs but airflow is noticeably reduced or weak
- Loud grinding, rattling, or squealing noise during operation
- Fan blade wobbles or vibrates excessively
- Fan stopped working entirely — no sound, no movement
- Bathroom humidity and condensation not clearing after shower
✔ If these symptoms match, this is the most likely failed component in the system.
✔ In most cases, replacing this motor and blade assembly restores normal operation immediately.
📦 Part Details
- Part Number: S10940056
- SKU / Model: F675
- Type: Exhaust Fan Motor and Blade Assembly — 70 CFM, includes fan blade and mounting plate
- Replaces: OEM direct-fit motor assembly — fits Broan 675, NuTone 675, Broan F675, NuTone F675, and H600-series housings (no modification required)
- Brands: Broan, NuTone
- Note: Grille (model 10880266) is sold separately and is not included.
While the motor is out, inspect the grille cover (model 10880266) for yellowing, warping, or broken clips — it's a common companion replacement and takes 30 seconds to swap. If the housing itself shows rust or damage, this is the right time to assess a full unit replacement before reinstalling.
⚙️ Installation
Skill Level: Easy — 15–20 minutes. Turn off the circuit breaker for the bathroom fan before beginning — do not rely on the wall switch alone. Remove the grille cover, unplug the motor connector from the housing, slide out the old motor and blade assembly, and slide the new S10940056 assembly into the housing rails until it clicks into place. Reconnect the motor plug, reinstall the grille, restore power, and test — the fan should spin freely and quietly within seconds. Do not force the blade assembly into the housing; if it resists, check alignment of the mounting tabs.
✓ Model Repair Pages
Broan 675, NuTone 675, Broan F675, NuTone F675. Contact us to verify your model number before ordering.
💡 Pro Tip
The Broan F650 (50 CFM) and F675 (70 CFM) housings look nearly identical but use different motor assemblies — S10940056 is the correct part for the 70 CFM F675 only. Check the label inside your housing or on the grille before ordering. If your fan is in a larger bathroom or has a longer duct run, the 70 CFM F675 motor is the correct choice for adequate ventilation performance.
✅Compatibility & Cross Reference
Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.
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