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 What can I do when iGardener™ can't find my Irrigation Controller? Why aren't the buttons on my Irrigation Controller working? How do I connect my Irrigation Controller to Holman Home? Can I connect to my Bluetooth Tap Timer or Irrigation Controller via the web, the cloud, or away from my home? How do I know when the battery for my WX1 Tap Timer needs replacing? Comments 0 comments Please sign in to leave a comment.