An Orbit 57071 wireless sensor works with one controller but fails when a second controller is paralleled. The sensor is powered from only one controller.
The two transformers may be out of phase, causing a ground loop through the common wire. Reverse the 24VAC input wires (red/black) on one controller. This aligns the phases and allows the sensor to interrupt the common for both controllers.
Leave the sensor wiring unchanged. Swap the transformer leads on the controller that does not have the sensor power connected. This is safe and often resolves the issue.
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