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How do you tell if your ZERO Controller is faulty? There are many ways but the controller needs to be changed when an ERROR code appears on the ZERO QS-S4 LCD screen. Here are a few ways to diagnose a faulty controller as shown in the video below:
The ZERO 8X controller is a 52V 25A controller set. You have to determine whether you have a front and/or rear controller fault.
Here is how to diagnose whether it is a front and rear controller issue:
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