Do you have a way to test what the rain sensor is doing e.g. a multi-meter with continuity indicator?
Sometimes a sensor will jump back and forth between two states when it is near the switch over point.
I have been testing here with a switch connected to the rain sensor input and don't see what you describe.
Dan
Sometimes a sensor will jump back and forth between two states when it is near the switch over point.
I have been testing here with a switch connected to the rain sensor input and don't see what you describe.
Dan