C300 controller and matching display

[Tadeusz]

Hello. I am new to the group and I am seeking your help in getting my bike back on the road.
The backstory is I bought the fat tyred folding bike from ebay and after a few months the display a c500 fried which I replaced but it showed error 9
So either the new display is faulty or the controller is faulty.
That's is why iam looking for both a controller and matching display. I would really appreciate any advice.
Thanks in advance Tad

 

[vfr400]

I would always recommend KT controllers with LCD3 display, which you can get from PSWPower or Topbikekit. Your present controller is 17A, so try and match it. The current isn't important, but, it's how much power you get when hill-climbing.