Question
Jim,

I have a Vision 1 controller and no display.  I checked both the top and bottom fuses, both blown.  I replaced the bottom 1A fuse that was fine.  I went to replace the top 0.5A fuse and it keeps triggering.  Any suggestions?  Bad transformer?

Thanks in advance for your help.

Answer
Hey John, I hope this helps. The top fuse protects the controller from excess voltage (lightning, bad transformer, power surge, etc.) You might try checking your transformer and see if it is putting out between 22 to 26 volts. If you have had any lightning strikes lately, sometimes it will short out the panel, and no matter if the transformer is good or not, it will keep blowing the fuse, and the controller will need to be replaced. Try the transformer first. Good luck and have a great day.