This article explains how to troubleshoot the E26 Overheat Protection error on an Aventon eBike.

Use this article if your bike:

• Shows an E26 error code
• Loses motor assistance during riding
• Stops assisting after climbing or heavy riding
• Feels unusually hot after use

If you are unsure of your Aventon model, please confirm your model before continuing.

Stop troubleshooting immediately if anything looks unsafe, overheated, damaged, or smells burnt.

Before You Start

Please prepare the following:

• Order number
• Aventon model
• Photo or video of the E26 error code
• Photo of the display
• Photo of the motor area, if relevant
• When the issue first appeared
• Whether the bike powers on
• Whether the display turns on
• Whether the motor engages
• Whether the issue happened during climbing, heavy riding load, transport, storage, water exposure, crash, impact, modification, or third-party repair
• Photos of visible damage

Safety Warnings

• Do not continue riding if the bike is overheating, smoking, or has a burning smell.
• Do not continue riding if the bike has visible damage or motor resistance.
• Do not open sealed electrical components.
• Do not work on wiring while the bike is powered on or charging.
• Stop and contact support if you are unsure.

What This Error Means

The E26 Overheat Protection error means the controller or motor has overheated.

The system may temporarily shut down to prevent damage.

This may happen during extended periods of extremely heavy use, such as climbing a steep hill with maximum pedal assist applied.

Possible Causes

Possible causes include:

• Controller overheating
• Motor overheating
• Extended heavy riding load
• Long steep climbs with maximum pedal assist
• Damaged controller
• Damaged motor

Troubleshooting Steps

Step 1 – Allow the Bike to Cool Down

Turn the bike off before continuing.

Allow the bike to cool down for 1 hour.

After cooling:

• Restart the bike
• Ride approximately 1–2 miles on flat ground
• Check whether the E26 error returns

If yes – The E26 code still appears

Continue to Step 2.

If no – The error clears

The controller or motor likely overheated due to riding conditions.

To help prevent overheating:

• Lower the pedal assist level during climbs
• Pedal more during steep riding
• Take short breaks during extended climbing

Monitor the bike during future riding.

If the issue clears

Continue normal use and monitor the bike.

If the issue remains

Continue to Step 2.

Step 2 – Check Whether the Error Persists

After the bike has cooled down and been tested on flat ground, restart the bike and check whether the E26 error returns.

If yes – The E26 code still appears

The issue may involve the controller or motor system.

Please contact our support team with the photos/videos listed below so we can review the next step.

If no – The error no longer appears

The issue was likely caused by temporary overheating during heavy riding conditions.

Continue monitoring the bike during use.

Step 3 – Check Riding Conditions

Check whether the issue happened:

• During steep climbing
• With maximum pedal assist
• During prolonged heavy riding
• During hot weather conditions

If yes

The controller or motor may have entered protection mode due to excessive heat.

Reduce pedal assist during long climbs and allow cooling breaks during heavy riding.

If no

The issue may involve the motor or controller system.

Please contact support for further assessment.

If the issue remains

Please contact support.

Step 4 – Inspect for Visible Damage

Inspect the accessible motor and controller areas for:

• Visible damage
• Burning smell
• Signs of overheating
• Melted connectors
• Water exposure
• Impact damage

If yes – Visible damage is found

Stop using the bike immediately.

Do not continue riding or charging the bike.

Please contact our support team with photos/videos of the damaged area.

If no – No visible damage is found

Restart the bike and check whether the E26 error returns.

If the issue remains

The issue may involve the controller or motor system.

Please contact support.

When To Contact Support

Please contact support if:

• The E26 error remains after completing these checks
• The bike overheats repeatedly
• The motor does not engage
• There is visible damage or burning smell
• The bike shuts down repeatedly during normal riding
• The bike has been exposed to water, crash, impact, transport damage, modification, or third-party repair
• You are unsure how to safely complete a step

If the issue remains after these steps, please contact our support team and include the photos/videos listed below.

What To Send Support

Please send:

• Order number
• Aventon model
• Photo/video of the E26 error code
• Photo of the display
• Photo/video of the motor area, if relevant
• Photos of visible damage
• Confirmation of whether the bike powers on
• Confirmation of whether the display turns on
• Confirmation of whether the motor engages
• Confirmation of whether the issue happened during climbing, heavy riding, or hot weather
• Confirmation of whether the bike overheats repeatedly
• Confirmation of whether the issue happened after water exposure, crash, impact, modification, or third-party repair
• Confirmation of the troubleshooting steps already completed

Important Safety Notes

• Do not continue riding if the E26 error remains.
• Do not ride the bike if there is visible damage, overheating, smoke, burning smell, or motor resistance.
• Do not open the motor, controller, battery, or sealed electrical components.
• Do not force connectors.
• Do not work on wiring while the bike is powered on or connected to the charger.
• Contact support if you are unsure.