What would cause a 4600 Series operator to open up and intermittently stick open?

If manually it opens and closes fine, check to make sure one of the actuators is not getting stuck in the on position. Verify that the "Operating Indicator" LED's -- "POWER and SAFETY CLEAR" LED's are lit on the control module. If the "NORMAL/SEQ" LED is also lit, one of the actuators may be stuck on. Disconnect the actuators from 16 & 17 one at a time to see which one would be sticking.

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