My neighbor’s GDO has stopped working. Press either the door button or the car remote and it starts to flash and there is a clicking sound. I checked the magic eye thingy (to use the technical term) and there is no obstruction. Both the sender and receiver lights are on. when I take the cover off there is no obvious damage - gears all look OK.
The door opens and closes smoothly and easily when I disconnect the GDO so there is no problem with the door or the tracks.
My neighbor is elderly (as my wife constantly reminds me, anyone a day older than me is elderly. I think she’s trying to tell me something.) and I can put in a new GDO for her, no problem. Lowes will sell me a new one for about $150 and it would take me a couple of hours. (I’ve done a couple of these in the last 20 years or so.) The alternative is to call in the professional who will diagnose it and bill her $300 to replace a $30 part. (And I'm not saying I begrudge a professional his fee; but replacing it will probably be the cheaper option.)
I’m mystified. I think it’s probably something simple but I don’t know where to start. The wall switch has, in addition to the up/down button, a lock button and one for the light only. As far as I recall there is just a double stranded wire to the wall switch so I assume that there is some circuitry to distinguish between the buttons so that the ceiling unit receives some pulse pattern which tells it what to do.
It’s a AccessMaster circa 2005, 1/2 HP, chain drive. Any thoughts? Just from the pov of waste I hate to just put in a new one and junk the old one which is probably perfectly fine but which would cost more to fix than to replace. I’ve pulled the manual from the web but it’s not a lot of help: it says that if the light flashes you have an obstruction so clear it.