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Hi, There is a screw on front part of the motor IE: chain side of the motor this makes the adjustment by turning it to make your door open/close by the correct amount, also remember to oil the moving parts as these require regular maintenance. Please leave me feedback, best wishes, Malcolm Campbell.
Each manufacturer of aftermarket remotes for Overhead doors has a specific sequence for a specific door opener mfg and model #. And those sequences are include in the printed matter in the packaging of the remote. If you have Merlin remote and Merlin opener contact the local Merlin installer for the sequence.
go to manufacturer website and contact them for a detailed step by step procedure, ask any school child to help you with programming the electronics, call a garage door specialist to come program it for you.
Check your own remotes ! If you have an extra in a junk draw every time you open and close the draw you can possibly have something bump up against one of the buttons and with their sensitive buttons they can easily be triggered.....I had a customer that was happening to her . Another situation could be leaving a remote in a pocket or purse ...again these buttons don,t need much to send a signal to your opener without you even realizing it! Another situation I have seen is a neighbor having the same age machine as you ..the frequency transmitting signal has changed over the years because of interference from other remotes or microphone signals such as police radio,s ..ambulance...fire stations all use these frequencys , also local airports and private planes all transmit these signals ...even your neighbors remotes were a problem until they came up with rolling code technology , if you have this then you should not have any interference from any outside signals and you probably have a remte laying around that's getting bumped ! If you and a neighbor have similar machines from earlier then 1985 then you probably have a garage door opener with dip switch technology ....On the dip switch settings you have to set your own code but most people had them installed straight out of the box without any code changing and left the factory settings to 0....Well most likely your neighbor also did not change from the factory settings and that can be another scenario....These are all things I have seen as a garage door mechanic and could be possible scenario,s for troubleshooting your problem , Hope I was able to help you but if all else fails then definetly go with a new receiver kit because it would definetly have rolling code technology
Release the door from the opener and operate it by hand. Check for binding and excess heaviness of door. You may also need to increase the up force. Heaven only knows where it is on a Merlin.
If the LED is flashing rapidly when the button on the remote is not pressed you have interference from something. Check for old remotes stored in a drawer somewhere or some new electric item nearby. Start unplugging things until that rapid flashing stops.
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