The one that does function with the alarm acts with a constant beep if the roller is stuck and the sensor is covered with water. The one that does not perform the alarm sounds will also like your, have the constant blue and red LEDs lighted even if the roller is stuck and the water level is over the sensor level.
What puzzles me is that even if you had one motor stuck due to a snail and your controller is like one of mine, the other motor still should turn and relieve the rising water.
Try this, change out the controller since you have another from the two units that is not being used for the tandem setup.
What puzzles me is that even if you had one motor stuck due to a snail and your controller is like one of mine, the other motor still should turn and relieve the rising water.
Try this, change out the controller since you have another from the two units that is not being used for the tandem setup.