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[[File:NinebotMaxError21.png|thumb|center | [[File:NinebotMaxError21.png|thumb|center|Error 21 on a Ninebot Max.]] | ||
"Battery Communication Error, Please check the Battery, Control Board & related connections" | "Built-in Battery Communication Error, Please check the Battery, Control Board & related connections" | ||
{{Ninebot Max Error Code SEO|21}} | |||
If you have a [[Ninebot ESX]] (ES1, ES2, ES3, or ES4), instead see: [[Ninebot ESX Error Code 21]] | |||
==Cause== | ==Cause== | ||
Error 21 is thrown when the ESC is unable to receive any data from the BMS/Battery. | |||
This may be because the 4 pin BMS data line has come unplugged or is not firmly plugged into the ESC. | This may be because the 4-pin BMS data line has come unplugged, or is not firmly plugged into the ESC. | ||
It can also happen when the battery is fully dead or something has killed the BMS board inside. | It can also happen when the battery is fully dead or something has killed the BMS board inside. | ||
A failed BMS flash can also cause this error code. | |||
==Fix== | ==Fix== | ||
The first thing to check is that the battery had not somehow become unplugged: | |||
*Remove the bottom panel and the control board so that you can access the wires more easily. | |||
*Unplug and then plug the 4-pin data line back in, making sure it clicks into place in the JST connector. | |||
*Plug the scooter into the charger and leave it for a few hours. | |||
If | If the error is still being thrown, check that the blue LED light is still blinking in the window on the battery. | ||
If the led is not blinking, but the scooter is still able to remain powered on (even with the error code), the BMS may be dead. | |||
If you have a multimeter, it would be wise to check that the battery voltage is somewhere between 30-42v. | If you have a multimeter, it would be wise to check that the battery voltage is somewhere between 30-42v. | ||
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If it is, the BMS board needs to be replaced. | If it is, the BMS board needs to be replaced. | ||
Alternatively the entire battery can be replaced as the BMS replacement is a bit involved. | Alternatively, the entire battery can be replaced as the BMS replacement is a bit involved. | ||
There are still some unknowns about this error code and as of yet, the cause is yet to be fully understood in some cases. | |||
[[Category: Scooters]][[Category: Ninebot]][[Category: Max]][[Category: Error Code]] | [[Category: Scooters]][[Category: Ninebot]][[Category: Max]][[Category: Error Code]] |