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value is "2".
To convert unit, press the UP/DOWN button to increase or decrease
until the desired setting is displayed.
To store a changed setting, press the MODE button, and then access
trip distance clearance settings.
To store a changed setting, hold the MODE button for 2s and then
exit general settings.
Mile and Kilometer Conversion Settings Interface
General Parameter Settings
To access general parameter Settings interface, hold both the UP
and the DOWN button for 2s, then hold both the DOWN and MODE
button for 2s again.
◆Wheel Diameter Settings
Ld represents w heel diameter settings. Electable values are 16, 18,
20, 22, 24, 26, 700C and 28. The default value is 20 inch.
To change basic settings, press the UP/DOWN button to increase
or decrease until the desired value is displayed.
To store a changed setting and access speed-limit settings
interface, press the MODE button.
◆Speed-limit Settings
LS represents the limit speed settings. When the running speed is
Wheel Diameter Settings Interface
7
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Need help?
Do you have a question about the KD21C and is the answer not in the manual?
Questions and answers
Speedometer stopped working.
Speedometer stopped working
To fix the speedometer on a Key-Disp KD21C, follow these steps:
1. Check Speed Sensor Settings – Ensure the speed sensor settings are correctly configured under the personalized parameter settings.
2. Verify Wheel Diameter – Ensure the correct wheel diameter is set in the display settings to ensure accurate speed readings.
3. Inspect Connections – Check the wiring connections between the display and controller to ensure they are secure and undamaged.
4. Look for Error Codes – If an error code appears, refer to the error code list and address any abnormalities.
5. Reset to Default Settings – If the issue persists, restore default settings under the display's settings menu.
6. Check Power Supply – Ensure the display and e-bike system are powered correctly.
7. Avoid Modifying System Parameters – Modifying system parameters incorrectly may cause display malfunctions.
If the problem continues, professional repair may be needed.
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How to erase total miles on display
The total miles (odometer reading) on the Key-Disp KD21C display cannot be erased. Only the trip distance can be reset to zero by holding the MODE button. The odometer will continue counting the total distance traveled.
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How to reset to default settings
To reset the Key-Disp KD21C to default settings:
1. Hold both the UP and ON/OFF buttons for 2 seconds to access the selection interface.
2. Use the UP/DOWN buttons to choose “Y” (Yes) for recovering default settings.
3. Hold the ON/OFF button for 2 seconds to confirm.
4. The display will show DEF-00 and return to the startup page.
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I have error 24in my lcd
Error 24 on the Key-Disp KD21C LCD means "Motor Hall Signal Abnormality."
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I have error number 24 my bike is cuybike
Error number 24 for a Key-Disp KD21C bike means "Motor Hall Signal Abnormality."
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