Rain Director Header Tank is Overflowing – Cat 5 Signal – V2 robcooper Apr 21, 2020 // Modified 1 year ago Check cat5 cable signal. If possible use a CAT 5 tester to ensure that the signal is constant between the two ends. There may be damage to the cable somewhere on the run. Was the signal constant? YESNO Unable to use a CAT 5 Tester? SKIP