Why are the LED lights red on my Irrigation Controller? Holman Industries 24 April 2020 06:44 Follow Red LED lights on an Irrigation Controller can indicate a flat 9V battery. Try replacing this to resolve indicator. Related articles How do I reset my WX1 Tap Timer? How do I know when the battery for my WX1 Tap Timer needs replacing? How can I prepare my Irrigation Controller or Tap Timer for winter? Why is my BX1 / BX2 / BX4 Bluetooth Tap Timer flashing red? Why won't my WX1 Tap Timer turn on? Comments 0 comments Please sign in to leave a comment.