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liftmaster Chamberlain Garage Door Opener Transmitter 300MC - Page 6 Questions & Answers
Liftmaster Professional Formula I, will not
On the operator is a screw adjuster for how far down the door goes. Find this adjustment and rotate it in the direction of less travel. Then you may have to spend a few minutes setting it so the door closes snugly.
Gary
My lift-master garage opener works
We have the same model and similar difficulties. We were told it's a bad antena. Not sure if there is anything we can do about this. Sometimes it works with the remotes, sometimes not. Always works with the wall switch, because that's wired.
My Liftmaster 373LM remote and wireless 377LM Keypad not working
You should have a small wire hanging down from the back of the opener. This is the remote control antenna wire. Strip off about and inch splice a wire to it. The connections is just twisting the wires together. Run the extended wire up to the ceiling and down the wall where the door is located. Most of the time in the top corners where the weather stripping is, there is a small gap. Slip the wire through the gap so the wire extends outside of the door. The key to this is getting the wire outside. 99% of the time this extension of the antenna will be enough to conquer interference issues. You are correct that you are running on 315mhz and the military will not affect it. Let me know if it helps
Show me your garage
Just keep things in ascending or descending order with respect to the size of items.
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