Hunter Pro C Troubleshooting
I have a Hunter Pro C outdoor controller with the base module plus 2 additional modules (total of 9 zones). It has worked for 5 years and this summer, until a few days ago. Now, whenever it has power, zone 3 is always on, even with the dial in the OFF position. The only way to turn off zone 3 is to unplug the power cord. When trying to run manual stations, I get ERR in the display on all zones, and none of the other zones will turn on. Running the diagnostic program also displays ERR for all zones. I have removed the control module and installed it in a neighbors unit and it works fine. Installing his control unit into my box gives the same results as with my control unit. I have manually jumpered all zones from the transformer and they all work fine. I have also reset the control unit, with the same results.
Could the main module be bad? Any help would be appreciated.