Sous vide heating but not moving water, or making a stalled buzzing sound? The impeller is the small propeller that circulates the bath, and scale or debris can jam it so it cannot spin.
Here is why the impeller sticks and how to free it.
This article will teach you:
- What the impeller does
- Why it jams
- How to clean it
- How to prevent it
Why the Impeller Sticks
- Scale binding the impeller to its housing.
- Food debris drawn into the pump.
- A leaked-bag particle jamming the blades.
- Corrosion from hard water.
What You’ll Need
- White vinegar
- A soft brush
- Your owner’s manual
How to Free a Stuck Impeller
- Unplug it. Power down before removing the skirt or cap.
- Open the housing. Remove the bottom skirt to reach the impeller per your manual.
- Descale and clean. Soak in vinegar and brush scale and debris away.
- Spin to test. Confirm the impeller turns freely before reassembling.
Pro Tip: If a bag ever leaks food into the bath, clean the impeller right after. Food particles pulled into the pump are a common cause of a jammed impeller.
When to Look a Little Deeper
Because the impeller drives circulation, it helps to check related parts, and reviewing pump noise, a circulation problem, or a motor issue can reveal the cause.
When to Call a Pro
If the impeller is clean and free but still will not spin under power, the motor has failed, which usually means replacing the unit.
Wrapping Up
A stuck impeller is usually scale or debris. Here’s the recap:
- Unplug before opening.
- Remove the skirt to reach it.
- Descale and brush it clean.
- Confirm it spins freely.
Clean the impeller, and circulation returns. You’ve got this.