Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
Is the antenna wire fully extended? If it is, can you adjust the orientation to get the best reception?
Since you have done the basic (fresh battery and reprogram), it is most likely due to the interference of other microwave noise. Garage door remote operates between 300-400 Mhz which is the low end of UHF, devices with inadequate shielding or grounding may emit noise in this range. Try to turn off all PCs in your house to see if they are the source. If they are, you may need to change the power supply unit.
Posted on Sep 26, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
Feb 23, 2011 | liftmaster Garage Door 1/2 Hp
COULD BE A BAD REMOTE, I WOULD TRY ANOTHER ONE FIRST.
COULD BE A FREEZER ETC. PUTTING OUT INTERFERENCE.
Anytime a door opens and/or closes randomly or doesn't work consistently I look for a smashed wire between the motor unit and the wall button.
If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote signal.
Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.
The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone
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