My LA412 gate controller is not staying open for more than an hour. Tech support suggest that the battery charge is not sufficient due to age. In addition, they said the system had to hold the gate open. I am a control system engineer and using power to hold a gate would be inefficient. The close signal or timer should initiate the close action. Does anyone know where I could find a service manual for this system?
I am assuming this forum is related to Liftmaster gate controllers as well as garage door openers. If I am wrong, sorry for your time.