My Craftsman 1/2 HP garage door opener model 139.53914 allows the garage to close but when I return home, the garage is open. What is the problem and solution?
The reason garage doors open by themselves is usually from rf (radio frequency) signal in the area. Sometimes the rf comes from something inside the house, sometimes something in the neighborhood is leaking rf signal.
Look on the motor unit to see if the LED is flashing. If it is flashing your garage door opener is receiving a rf signal. If the flashing is rapid the rf signal is strong, if the flashes are slow or intermittent, the rf signal is weak. When the rf signal gets strong enough it will confuse the logic board in the opener and it will either open or close the garage door. This signal can be coming from something in your garage or house or from somewhere in the neighborhood. Remove the batteries from your remotes and keyless entry and see if the flashing stops. Is there an old remote stored somewhere? If there is remove the battery from it. If you don't find the source here, start turning off circuit breakers for the house. Watch the led as you turn the breakers off so you know if it stops blinking which circuit the source is on.If you don't find the source of the rf you can schedule service and get a Sears technician to check the garage door opener. Sears technicians have an rf signal locater to find the source of the rf.The flashing LED might only occur when the door is opening by itself.Member
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