Why does my blender smell like electrical burning?

If you notice a burning smell coming from your blender, it’s often a sign of an electrical issue that needs attention. Let’s explore some of the most common reasons blenders can start to smell like they’re burning, and what you can do about it.

Motor Overheating

One of the most common causes of a burning smell from a blender is an overheating motor. Blender motors are designed to handle short bursts of high speeds to finely blend ingredients. But if you run your blender too long, the motor can overheat from the strain and friction of continuous use.

Signs your blender motor is overheating include:

  • A burning smell, like rubber or plastic overheating
  • The motor slowing down during use
  • The blender stopping altogether
  • The bottom of the blender feeling hot to the touch

To prevent motor overheating:

  • Only blend in short bursts of less than one minute, allowing the motor to rest in between
  • Avoid lengthy blending tasks – blend thick mixtures in smaller batches
  • Don’t fill the blender jar past the max fill line
  • Make sure the blades spin freely and aren’t obstructed

If the motor still overheats with normal use, it likely needs servicing or replacing.

Electrical Short

Sometimes a burning smell from a blender is due to an electrical short in the motor or wiring. This occurs when there’s a break in the motor’s insulation, allowing wires to make contact and generate heat. The results can range from a burning smell to full-on sparking.

Causes of electrical shorts in blenders include:

  • Old, damaged, or worn out insulation around wires
  • Loose, faulty, or misaligned connections
  • Cracked or damaged plugs or cords
  • Power surges damaging the motor or electrical components

If you suspect an electrical short, unplug the blender immediately. Blenders with shorts can be fire hazards if left plugged in. The unit will likely need a full inspection and repairs by a technician.

Friction From Jammed Blades

Issues with the blender’s blades themselves can also lead to overheating and burning smells. If thick ingredients or debris become lodged in the blades while blending, it can prevent them from spinning properly. The blades will strain against the obstruction, generating excess friction and heat.

Signs of jammed blender blades include:

  • A grinding or rattling noise when starting the blender
  • The blender won’t start or blades won’t spin
  • Blender works but ingredients aren’t processing smoothly

To help avoid jammed blades:

  • Don’t overfill blender jars
  • Cut ingredients into smaller pieces before blending if needed
  • Don’t add extremely hard items like ice cubes or frozen foods
  • Stop blending immediately if blades sound obstructed

Remove and inspect blades regularly for debris buildup. If blades are bent or damaged, replacement is needed.

Faulty Bearings

The bearings that support and allow the blender’s motor shaft to spin freely can also wear out over time. Damaged bearings put extra strain on the motor, causing it to overheat with a burning odor.

Signs of faulty blender bearings:

  • Loud rattling sound when running
  • Blender lacking power and torque
  • Motor feels loose and shaky
  • Burning smell from bottom of motor

Replacing worn blender bearings requires disassembling the motor housing. This is best left to experienced repair technicians. It’s generally more cost effective to replace the entire blender.

Melted Internal Parts

In severe cases of overheating or electrical issues, the internal electrical components and wiring can actually melt inside the blender. This causes a very noticeable acrid burning odor when running the blender. Smoke or even flames may also occur.

Melted parts will disable the blender fully. Any signs of melting or charring mean the unit is unsafe to operate and the damage is beyond DIY repair. The blender will need complete replacement.

How to Diagnose the Cause

Pinpointing what exactly is causing your blender to smell like burning can take some detective work. Here are tips on diagnosing the root of the problem:

  • Unplug and inspect the blender first. Check for any signs of overheating damage before doing anything else.
  • Note when the smell occurs. Does it happen right when starting the blender or after running for a while? This can indicate if it’s a connection issue or overheating from use.
  • Check the wall outlet. Make sure the outlet and circuit are in good condition and not contributing to an electrical short.
  • Test the blades. Spin the blades with your hand to feel for grinding or resistance. Also look for debris buildup.
  • Open the base if possible. Carefully inspect the internal wiring, connectors, and bearings for damage. This depends on your blender model type.
  • Consider the blender’s age and use. Older blenders are more prone to wear-related issues like bearing and insulation deterioration.

It also helps to compare the smell. Electrical burning smells are often sharp and acrid, versus rubbery overheating odors. The specifics can provide clues to the blender’s issues.

When to Call a Repair Technician

While minor issues like jammed blades may be DIY-fixable, electrical problems with blenders should be handled by professionals. Don’t attempt repairs yourself on:

  • Damage to internal wiring
  • Detached or melted components
  • Any sign of short circuiting or sparking
  • The blender repeatedly burning out

Be prepared with the blender’s make and model, if known. Technicians can either repair the specific issue or advise if a full replacement is needed based on inspection.

Replacing a Burning Smell Blender

If your defective blender is past its prime, purchasing a new one may make the most sense. When shopping for a replacement, look for models with features that can prevent common issues leading to burning smells:

  • Overload protection – Shuts off the motor before overheating.
  • Vented housing – Allows heat dissipation to prevent motor overheating.
  • Heavy-duty insulation – Reduces risk of shorts from damaged wiring.
  • Sealed components – Prevents leaks, debris buildup, and associated hazards.
  • Quality bearings – For smooth, reliable operation and long life.

Investing just a bit more in a durable, well-made blender can provide years of reliable performance and odor-free use.

When to Throw Out a Blender

In some situations, it’s not worth attempting to fix or salvage a blender that’s begun to emit burning odors. Blenders with the following damage should be safely discarded:

  • Severe overheating damage to internal parts and wiring.
  • Heavy smoke or actual flames produced when operated.
  • Frayed, damaged, or hazardous power cord.
  • Cracked or broken base allowing access to electrical components.

Err on the side of caution – if the blender appears unsafe or you’re unsure of the extent of damage, replacement is the wise choice over repairs.

Preventing Burning Smells

With proper use and care, you can minimize the chances of your blender overheating and producing unpleasant burning odors:

  • Don’t overload blender jars to avoid straining the motor.
  • Only run the blender for needed short bursts; don’t leave on unattended.
  • Regularly clean blades and base to prevent buildup of debris.
  • Follow all manufacturer instructions and safety precautions.
  • Don’t use harsh cleaning chemicals that could damage parts.
  • Check that the blender sits level and steady during use.
  • Keep the blender unplugged when not in use to prevent shorts.

And of course, replace the blender or have repairs made at the first sign of any electrical issue. Addressing problems early on can prevent more extensive damage down the line.


A burning smell coming from your blender is a sure sign of a underlying electrical problem or part failure. Identifying the specific cause early and having proper repairs made is key to resolving the issue before it leads to permanent damage or hazardous conditions. With attention and care, most common causes of blender burning odors can be reversed or avoided altogether.

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