Start/Trial/Cross: 1,2 or 3 LED indication after power ON, motorcycle not responding

WARNING!

If You don’t have suffcient mechanical knowledge, experience and proper tools, we strongly recommend, that You have these operations done by Your selling dealer or at Your local motorcycle service center! Making mistake during the disassembly or assembly of the electric system will void the warranty and may cause a hazardous situation, resulting in fire, severe injury or death and damage to property.
For safety reasons it is strongly recommended to leave the battery discharged before handling any component of the motorcycle's electrical system!
Do not let the battery to stay fully discharged for longer than neccessary, as it may have a negative impact on its capacity. Charge the battery after each ride.

Table of contents:

Faulty accelerator
Faulty charger, charge port or battery
Faulty controller
Faulty motor

1. Faulty accelerator

Follow these steps to check the accelerator function:

Check, whether the accelerator rotates freely and is not stuck in one position.
Check, whether there's no water, mud or other debris on the accelerator, since it is not completely waterproof.

2. Faulty charger, charge port or battery

Follow these steps to check the function of each part:

Required tools:

multimeter
hex wrench #6
Torx wrench #T25

Ensure, that the magnetic kill switch is in OFF position (magnet NOT attached).
Place the motorcycle on a solid and level surface of a mounting stand, so that both wheels are on the ground.
Connect the charger to an electrical outlet. The LED on the charger will glow blue (Lead-Acid battery charger) or green (Li-Ion battery charger). If the charger have no visible LED indication, even if it has a LED, then it is probably faulty.
Measure the charger output voltage – it should be approx. 44.5 V for Lead-Acid battery charger and approx. 42 V for Li-Ion battery charger. If the charger has very different output voltage (difference greater than 1.5 V), or the output voltage is measurable only when its connector is in specific position, the charger or its connector may be faulty.
Connect the charger to the charge port on the motorcycle. The LED on the charger will glow red (Lead-Acid battery charger) or yellow (Li-Ion battery charger). If the LED colour does NOT change after connecting, the charge port may be either disconnected from the battery, or it may be faulty (see below).
Charge the battery to 100%, then disconnect the charger from the motorcycle and note the current time. When charging is finished, the LED on the charger will glow green. If the charging process will not finish even after 12 hours, the charger or battery may be faulty.

Follow these steps to uncover the motorcycle battery and charge port:
(Only for Cross): Using the hex wrench #6 loosen and remove the underseat bolt, located on the underside of the upper plastic bodywork (above the rear wheel), slide the seat forward and remove it from the motorcycle.
Using the Torx wrench #T25 loosen and remove the upper 4 bolts from the upper plastic bodywork (2 on the left side + 2 on the right side).
Remove the upper plastic bodywork by gentle pull up.
Using the Torx wrench #T25 loosen and remove the 4 additional bolts from the left and right plastic bodywork (2 on the left side + 2 on the right side) and with a light frame tilt on the mounting stand remove both plastic bodyworks.

NOTE:
The Lead-Acid battery in Start consists of 2 batteries, each with 12 V nominal voltage (above 14 V fully charged), connected in series. The Lead-Acid battery in Trial/Cross consists of 3 batteries, each with 12 V nominal voltage (above 14 V fully charged), connected in series. The Li-Ion battery consists of 1 battery, enclosed in a metal box. Every KUBERG battery for Start/Trial/Cross has a rubber surface from below to prevent abrasion between the frame and a battery and to minimize the risk of formatting an impact cracks.
Wait 1 hour from the moment of disconnecting the charger from the motorcycle, then measure the DC voltage of the battery:
(Only for Lead-Acid version): Do NOT disconnect any cable and measure the voltage directly on each battery. If the voltage is below 12 V, consider battery exchange. Optionally You can use a charger with recovery mode to charge each battery separately. When changing batteries, do NOT mix old batteries with new ones! (see knowledgebase article "Battery removal and installation")
(Only for Li-Ion version): Disconnect the main red battery connectors and measure the battery voltage directly on battery poles. If the voltage is below 34 V, consider battery exchange. (see knowledgebase article "Battery removal and installation")
Disconnect the charge port and clean it properly with technical alcohol and pressurized air.
Disconnect the charger from the electrical outlet.
Use a multimeter with the circuit check function. The correct function of the charge port is: Without the charger, middle and right pin on the output connector = open circuit / With the charger, middle and right pin on the output connector = closed circuit.

Follow these steps to reassemble the motorcycle:
With a light frame tilt on the mounting stand reinstall the left plastic bodywork and using the Torx wrench #T25 install and tighten the 2 lower bolts (5 - 6 Nm).
Repeat the same step with the right plastic bodywork.
Reinstall the upper plastic bodywork, align its 2 left holes with the holes on the frame and on the left side bodywork, reinstall 2 bolts and using the Torx wrench #T25 tighten them (5 - 6 Nm).
Repeat the same step on the right side.
(Only for Cross): Install the seat by sliding it backward on the bolt, located close to the Torque & Speed control button, and align the hole in the seat and the upper plastic bodywork with its corresponding hole on the frame just above the rear wheel.
(Only for Cross): Install the seat bolt and tighten it using the hex wrench #6 (16 - 18 Nm).
Double check, that all bolts and nuts are properly tightened.

3. Faulty controller

Follow these steps to check the controller function:

Required tools:

multimeter
hex wrench #6
Torx wrench #T25

Make sure, that the magnetic kill switch is in OFF position (magnet NOT attached) and the battery state of charge is very low.
Place the motorcycle on a solid and level surface of a mounting stand, so that both wheels are on the ground.
(Only for Cross): Using the hex wrench #6 loosen and remove the underseat bolt, located on the underside of the upper plastic bodywork (above the rear wheel), slide the seat forward and remove it from the motorcycle.
Using the Torx wrench #T25 loosen and remove the upper 4 bolts from the upper plastic bodywork (2 on the left side + 2 on the right side).
Remove the upper plastic bodywork by gentle pull up.
Using the Torx wrench #T25 loosen and remove the 2 additional bolts from the right plastic bodywork and with a light frame tilt on the mounting stand remove the plastic bodywork.
Disconnect the main yellow motor connector between the motor and the controller.
Turn the motorcycle kill switch ON (magnet attached).
Use a multimeter to measure DC voltage output from the controller directly on the yellow connecor. The correct function is: No accelerator applied: 0-2 V / Light or full accelerator applied: up to 29 V (Start) or up to 42 V (Trial/Cross). If there's no voltage output during the accelerator twist, the controller is probably faulty.

4. Faulty motor

Follow these steps to check the motor function:

Required tools:

multimeter
hex wrench #6
Torx wrench #T25

Make sure, that the magnetic kill switch is in OFF position (magnet NOT attached) and the battery state of charge is very low.
Place the motorcycle on a solid and level surface of a mounting stand, so that both wheels are on the ground.
(Only for Cross): Using the hex wrench #6 loosen and remove the underseat bolt, located on the underside of the upper plastic bodywork (above the rear wheel), slide the seat forward and remove it from the motorcycle.
Using the Torx wrench #T25 loosen and remove the upper 4 bolts from the upper plastic bodywork (2 on the left side + 2 on the right side).
Remove the upper plastic bodywork by gentle pull up.
Using the Torx wrench #T25 loosen and remove the 2 additional bolts from the right plastic bodywork and with a light frame tilt on the mounting stand remove the plastic bodywork.
Disconnect the main yellow motor connector between the motor and the controller.
Use a multimeter to measure DC voltage output from the motor directly on the yellow connecor. The correct function is: No rear wheel rotation: 0 V / Light rear wheel rotation: above 0 V depending on the RPMs. If there's no voltage output during the rear wheel rotation, the motor is probably faulty.
Listen carefully, whether there are no weird sounds from motor during rear wheel rotation (or any uncomfortable smell), which would also point to the faulty motor. If you saw a voltage increase with wheel speed, then the motor stator most likely has a good connection with the brushes, that transmit the power to the rotor.

If Your motorcycle is under warranty, please register it on our website, if You have not already done so:
https://www.kuberg.com/en/bike-registration

If the problem persists, please contact Your dealer or KUBERG customer service (support@kuberg.com). For the fastest possible resolution please send:

VIN of Your motorcycle (it is stamped on the right side of the steering column).
Detailed information on actions taken so far, a few photos and preferably a video.

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Start/Trial/Cross: 1,2 or 3 LED indication after power ON, motorcycle not responding

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