W20000 Code
Check Haro W20000 e-Bike Error Code :
Indication conditions
The power was turned OFF due to the temperature exceeding the guaranteed operating range.
Operational restrictions being displayed
No system functions will start.
Solution
If it has exceeded the temperature in which discharge is possible, leave the battery in a cool place away from direct sunlight until the internal temperature of the battery decreases sufficiently.
If the temperature has fallen below the temperature where discharge is possible, leave the battery indoors or other suitable area until the internal temperature rises sufficiently.
If the error persists, contact your place of purchase or a distributor for assistance.