I have trouble shot the valves both function manually. Both rec. power from timer. Signal strength is 15 compared to 28 close to timer. I think it's electrical. I need ideas to fix. The installer is no longer in business and this is my church. The valve are the 2 farthest from timer and the installer has several boxes he spliced the wires through out the system. The system has 18 zones. Any ideas?
