There are certain situations in which something has gone wrong on the bike and the LCD display shows an error code to you. This guide will let you know what each error code means in relation to your bike. The error codes do not cover everything that can go wrong with the bike, but they do cover quite a few things and you should be aware of their meanings in case they pop up for you.
Error Code 21 - Current Abnormality Definition: Generally means there is an issue with the controller. More specifically that there is too much current leaving the controller. Possible Causes
- When using a higher power motor than what is compatible with your controller, your LCD system may stop working and display this error.
- When the instant current exceeds double the rated current, or the continuous current exceeds the rated current, it may stop working and display this error. Since all controllers for Tower eBikes are 48V/20A controllers, this error means that the instant current is over 40A or the continuous current is over 20A.
What to do: Call our team at 866-622-447 and confirm your Error Code 21. A new controller is likely necessary.
Error Code 22 - Throttle Connection Error Definition: There is a faulty connection running from the throttle sensors to the main controller. Throttle is not responding even after the battery is turned on, LCD is powered up, and the throttle button is pushed in. Possible Causes
- Throttle cable is not properly connected to the main wiring harness or has visible damage.
- Magnets inside of the throttle have become dislodged due to damage.
What To Check (Before Calling Tech Support): Follow the cord running from the throttle into the black wiring on the front of the bike. Unravel the black wiring until you reach the plug connection. Inspect the plug connection where this cord reaches. If the inner color of the cord (yellow) is showing at all then it is not properly 7 connected. It is advised to unplug and replug back in this connection to ensure it is properly connected.
Error Code 23 - Motor Connection Error Definition: Wiring running from the rear hub motor to the controller is damaged/faulty/not connected. Possible Causes
- Wiring below the right foot pedal is damaged or cut.
- Cable wiring has become undone or disconnected.
- If the bike fell over and landed on the cable spring and has been damaged or pushed in.
What To Check (Before Calling Tech Support): Inspect the wiring coming out of the right side of the motor hub. There is a black cap on it for protection where it connects to the motor hub. Follow this cable all the way to its connection point underneath the right pedal arm. Ensure the connection is tight and secure.
Error Code 24 - Motor Hall Sensor Error Definition: The sensor within the rear hub motor is failing to read. Same with Error Code 23, there is an issue with the wiring running from the rear hub motor to the controller. Possible Causes
- Bike back motor has been damaged via a crash or hit.
What To Check (Before Calling Tech Support): Inspect the wiring coming out of the right side of the motor hub. There is a black cap on it for protection where it connects to the motor hub. Follow this cable all the way to its connection point underneath the right pedal arm. Ensure the connection is tight and secure.
Error Code 25 - Brake Sensor Connection Error Definition: Connection error between the brakes and the bike itself. Brakes will still manually work, but not they are not in sync with the speedometer and LCD screen. Possible Causes
- Caused by the brakes being used while the LCD screen is being turned on. While powering up the LCD screen make sure the brakes are not touched and in their upright position.
What to Check (Before Calling Tech Support) Try turning on your LCD screen while not touching any brake lever. If the error code persists, inspect brake cables. Follow the cable wiring running down from one brake lever and unplug the connection point. Turn on the LCD screen and test again. Run this test to figure out which brake lever (left or right) is causing this error code.
Error Code 30 - Communication Error - Unplugged Wiring Definition: Physical connection error between the LCD screen and the Controller. Possible Causes
- The only cause of this error is an unplugged cord somewhere running from the LCD screen to the controller.
What to Check (Before Calling Tech Support) Follow the cable running from the LCD screen and ensure it is plugged in underneath the black wiring frame. Ensure plugs underneath the controller, and by the foot pedals are plugged in firmly.
Everything DIY E-Bike Repairs
Homepage: eBike Repair Guide
eBike Repair Basics & Assembly
- eBike Specs and Walkthrough
- Tower eBike Serial Numbers
- Recommended Tools eBike Repairs at Home
- eBike Operation Guide
- Initial Build of a Tower eBike
- Tower eBike Torque Specs
- eBike Care and Maintenance
- Quick Reference eBike Repair Guide
eBike Brake System Service Guide
- eBike Hydraulic Brake System Introduction
- How to Adjust an eBike's Hydraulic Brakes
- How to True an eBike Rotor
- E-Bike Brake Rotor Install
- Brake Pad Install for E-Bikes
- How to Resurface eBike Brake Pads and Rotors
- How to Bleed Hydraulic Brakes on an eBike
eBike Drivetrain Service Guide
- How to Clean Your eBike Drivetrain
- Shifting Adjustment on an E-Bike
- Electric Bike Shifter Cable Install
- How to Install a New Chain on an eBike
- E-Bike Derailleur Installation
- Replace the Shifter on an E-Bike
- Replace an Electric Bike Cassette
- Crankset Install on an E-Bike
- E-Bike Derailleur Hanger Adjustment
- Installing Pedals on an Electric Bike
eBike Wheels & Tire Guide
- Flat Tire Repair on an Electric Bike
- New Tire Install on an Electric Bike
- Rear Wheel (with Hub Motor) Removal Guide
- How to True E-Bike Wheels
- Electric Bike Spoke Replacement
eBike Electric Repair Guide
- E-Bike Electrical System Overview
- Intro to Electrical Troubleshooting an eBike
- Methods of Electrical Troubleshooting an eBike
- Electric Bike Error Codes
- Electric Bike Battery Services
- Electric Bike Motor Issues
- E-Bike Will Not Power On
- Troubleshooting Pedal Assist on an E-Bike
- No Throttle Power eBike Troubleshooting
- E-Bike Does Not Pedal Assist or Throttle
- Intermittent Power Loss While Riding an eBike
Miscellaneous eBike Service Guide
