20 Most Recent liftmaster Chamberlain Garage Door Opener Transmitter 300MC Questions & Answers


Get a best garage repair provider from http://www.aqualitygaragedoors.com/. I recently hired them and find them best in Miami.

liftmaster... | Answered on Jan 03, 2019


Something could be blocking the electric eye.they are down at ground level on both sides of the door

liftmaster... | Answered on Dec 29, 2018


Try reprograming the opener to each remote, if this doesn't work then the command/radio module in the opener is damaged and needs to be replaced. Hopefully you can find one or you will have to replace the whole garage door opener. Good luck.

liftmaster... | Answered on Dec 29, 2018


batteries in remote maybe?

liftmaster... | Answered on Feb 03, 2018


hi
check that the door is free from stifness

liftmaster... | Answered on Jan 03, 2018


http://support.liftmaster.com/articles/How_To/LiftMaster-receiver-and-remote-compatibility-1484145638635

I don't believe a universal remote will work. Here is a link to compatibility

liftmaster... | Answered on Nov 27, 2017


It will only take a 4 digit program code. After you program the code, and then enter that code to open the door, hit an additional number on the keypad. Some need the additional digit to act like an 'enter' key.

liftmaster... | Answered on Oct 03, 2017


Disconnect power to the opener! Then, with a dental tool or small screwdriver scrape off any corrosion etc from the contact in the center of the socket. Also note if it is lying flat against the bottom of the socket. If so, gently lift the center so it has some spring retention and rises up off the flat bottom of the socket.

liftmaster... | Answered on Sep 23, 2017


Check alignment of the obstruction sensors .... they shoot a light beam across the doorway about 6 inches above the floor. One is mounted on each side of the door track near the floor.

liftmaster... | Answered on Sep 23, 2017


This sounds like a similar problem that I had. The circuit board on the garage door motor has a capacitor that goes bad and this prevents the remotes from working. You can either buy a replacement circuit board online (for around $80 if I remember) or if you can solder, simply replace the capacitor for a few dollars. I answered a similar question on this site before after I went through the process. There are more details there. The capacitor in question was close to a heat producing component and over time it cooks.

liftmaster... | Answered on Sep 15, 2017


SORRY BUT THE GUY WHO GOT RID OF IT HAD THE RIGHT IDEA.
I DOUBT YOU CAN FIND A REMOTE AND IF IT HUMMS IT IS A POTENTIAL FIRE HAZARD.
SORRY I CAN'T GIVE YOU GOOD NEWS

liftmaster... | Answered on Sep 09, 2017


Your answer is in the last line, unless you have those lights, the opener assumes something is in the way. Make sure you have the green one pointing in the direction of the local sunsets as this is also a problem certain days of the year.

liftmaster... | Answered on Jul 25, 2017

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