A Butterfly mixer grinder that leaks liquid from the jar base or lid is messy and frustrating, but the cause is nearly always a worn seal or a loose part — both cheap and easy to fix at home. This guide explains why a Butterfly mixer leaks and how to stop it for good.
Quick Answer
A Butterfly mixer grinder leaks mostly because of a worn or misplaced rubber gasket, a loose blade assembly, overfilling with liquid, or a cracked jar base. Check and replace the gasket, tighten the blade assembly, do not overfill, and inspect the jar for cracks. A fresh gasket fixes the great majority of leaks.
Common Causes
- Worn or hardened gasket: The rubber seal around the blade assembly perishes over time and stops sealing.
- Gasket misplaced or missing: If the gasket is not seated correctly after cleaning, liquid escapes.
- Loose blade assembly: If the base nut holding the blade unit is loose, liquid seeps through.
- Overfilling: Filling liquids past the marked line forces liquid out under pressure.
- Cracked jar or base: A hairline crack in the jar or its base lets liquid out.
Step-by-Step Fixes
1. Inspect and replace the gasket
Unscrew the blade assembly at the base of the jar and examine the rubber gasket. If it is cracked, hardened, stretched or thin, replace it with a genuine Butterfly gasket. This is the most common cause and the easiest fix. For related leak issues, see our guide on a mixer grinder jar not fitting or leaking.
2. Reseat the gasket correctly
After cleaning, make sure the gasket sits flat and fully in its groove before reassembling. A pinched or off-seat gasket leaks immediately.
3. Tighten the blade assembly
Hand-tighten the base nut/blade assembly firmly. A loose assembly is a common cause of base leaks. Do not overtighten and crack the jar.
4. Do not overfill
Keep liquids below the maximum mark. Overfilling, especially with hot or frothy liquids, forces liquid past the lid and seals.
5. Check the jar for cracks
Hold the jar up to the light and inspect the base and walls for hairline cracks. A cracked jar must be replaced, as no seal will fix it.
How to Prevent Leaks
- Replace the gasket every 1–2 years or as soon as it hardens.
- Always reseat the gasket properly after cleaning the blade assembly.
- Keep liquids below the fill line.
- Let hot liquids cool slightly before blending to reduce pressure.
- Clean the jar and blade assembly gently — see our jar cleaning guide.
When to Call a Technician
Call authorised Butterfly service if:
- The leak continues after replacing the gasket and tightening the blade assembly.
- Liquid has entered the motor area, causing it to behave oddly — if you also smell burning, see our guide on the mixer grinder burning smell.
- The blade assembly is damaged or seized.
- The unit is under warranty.
Frequently Asked Questions
Why is my Butterfly mixer grinder leaking from the bottom?
Almost always a worn or misplaced gasket, or a loose blade assembly. Replace the gasket and tighten the assembly to fix it.
How often should I replace the gasket?
Every 1 to 2 years, or sooner if it hardens, cracks or starts leaking. Gaskets are inexpensive Butterfly spares.
Can I use the mixer if it leaks a little?
It is best not to. Liquid reaching the motor can cause damage or a short. Fix the leak before continued use.
Is a leaking jar dangerous?
Liquid entering the motor area can be hazardous. Stop using the mixer until the leak is fixed and no liquid is reaching the base.
A leaking Butterfly mixer grinder is almost always a gasket or blade-assembly issue. Replace the gasket, seat it correctly, tighten the assembly and avoid overfilling, and your mixer will stay leak-free.