Most common causes
Error code on the display
An error code is a clue, not a diagnosis. The meaning varies depending on the display and controller. View our explanation of error codes and, if in doubt, send a photo of the display via WhatsApp.
Display connector or cable
A damp or damaged display connector or wiring harness often causes communication errors. The pedal sensor, the pedal sensor intermediate cable, the display, or the controller can also be the cause. Disconnect the connector, dry it, and reconnect it securely. View wiring harnesses for the Qmwheel V20.
Defective display
The newer Qmwheel V20 has the H6C display with NFC and buttons, the same as the V20 Pro and S20. View displays for the Qmwheel V20.
Battery and controller
If the display does nothing at all, first check the battery (see "does not turn on"). If it shows an error code about the motor or sensors, the fault is often in the controller or wiring. An undervoltage error code is caused by an empty battery, a loose or broken intermediate cable from the battery to the controller, or a defective battery. There are several versions: 2022-2024 with a red motor connector and the controller under the battery, 2024-2025 with a red connector and the controller under the seat (short rear light cable), and the newest version with a black motor cable. View controllers for the Qmwheel V20.
What you need to know about the Qmwheel V20
- There are several versions: 2022-2024 with a red motor connector and the controller under the battery, 2024-2025 with a red connector and the controller under the seat (short rear light cable), and the newest version with a black motor cable.
- The newer Qmwheel V20 has the H6C display with NFC and buttons, the same as the V20 Pro and S20.
- The old V20 (2022-2023) charges with a 1-pin charger, the V20 from 2024-2025 with a 3-pin charger.
Step-by-step plan
- Start simple: fully charge the battery, reinsert the battery, and check all connectors at the handlebars.
- Look at the display: note any error code or take a photo.
- Send us a photo of the display, the connector, or the part via WhatsApp. We will tell you which part you need.
- Do it yourself or have it done: order the part, or make an appointment in The Hague or Zoetermeer. Your bike is often ready the same day.
Never work on the electronics while the battery is in the bike, and never open a battery yourself. Lithium batteries can be dangerous if damaged.
Other faults with the Qmwheel V20
- Qmwheel V20 does not turn on
- Qmwheel V20 turns off during riding
- Qmwheel V20 pedal assistance does not work
- Qmwheel V20 motor makes noise or does not pull
- Qmwheel V20 battery does not charge
- All faults with the Qmwheel V20
Frequently asked questions
Can I fix this myself?
Simple causes (charging the battery, checking connectors) certainly. For electronics and the motor, we recommend the workshop, or first send a photo via WhatsApp.
How much does a repair cost?
View the fixed prices on make an appointment. If you do not know what is wrong, choose the inspection fee (€ 30), which is waived if we perform the repair.
Do you have parts for the Qmwheel V20 in stock?
Yes, view all parts for the Qmwheel V20.