The mode switch contacts are worn, so the controller doesn’t recognize the OFF position. The microprocessor is likely failing.
Replace with an Irritrol Rain Dial or Rain Bird ESP controller.
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Replacing Toro Hydraulic Controller: Conversion Kit or Electric Valve Upgrade
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Toro Vision II Controller Repeatedly Cycles and Won’t Shut Off
Toro Greenkeeper 212 Switch Failure: 'Power Off' Display and Uncommanded Operation
Power Outage Causes Sprinkler to Run Uncontrollably: $700 Water Bill
Toro EL-6A Controller Replacement Leads to Total Failure – Pro Diagnosis Needed
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