Here are some potential troubleshooting steps for resolving issues with two zones running simultaneously, based on other posts I found in the Rachio community:
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Check Wiring: Ensure that the wiring is correctly connected. Verify that no wires are crossed or touching each other. Each zone wire should be securely connected to its respective terminal.
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Inspect Valve Solenoids: Check the solenoids on the valves to ensure they are functioning properly. A faulty solenoid can sometimes cause zones to run simultaneously.
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Controller Settings: Verify the schedule settings on your Rachio controller. Ensure that there are no overlapping schedules that could cause two zones to activate at the same time.
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Master Valve Configuration: If you have a master valve, ensure it is configured correctly in the Rachio app. Incorrect configuration can lead to simultaneous zone operation. Event if you do not have a Master Valve, check to make sure you have not accidentally enabled the Advance Wiring (M Terminal) settings.
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Power Cycle the Controller: Sometimes, simply power cycling the controller (turning it off and on) can resolve software glitches that may cause this issue.
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Firmware Update: Check if your controller firmware is up to date. Updating to the latest firmware can resolve known issues and improve performance.
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Contact Support: If the issue persists after performing these steps, please report back and consider contacting Rachio support to confirm there is no defect with the unit.
Hope that helps!