SOURCE: Remotes won't work
Sounds like a frequency issue. A remote work like the radio in your where each station is on a different frequency. Some signal is interfering with you frequency (390Mhz) You could try another brand external receiver with new remotes or with that old of an operator you might just think about replacing the operator (don't go with "Wayne Dalton")
SOURCE: Hi, Working with a Sears 1/2
The opener will not work without the sensors. Make sure you don't have a broken wire going to the sensors. Make sure the small light on each sensor is lit and not flickering. If you cannot get both lights to come on you have either a bad sensor or a wiring problem. If the main light flashes 10 times it is definitely a door sensor problem. The wall control may be bad now from usage. Remove it from the wall and short across the 2 wires. If that causes the door to try to move you then know the button is bad. You can also short across terminals #1 and #2. That would eliminate bad wiring to the wall control. Make sure the connections on the back of the motor unit are tight and that the 2 white wires from the sensors go to terminal #2 and the white wires with black stripes go to terminal #3.
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