I'm fixing up an older Genie Model 420(?) opener for a rental unit I
own. It was fitted with a Chamberlain receiver that refused to work
(with a Clicker remote) after I changed the DIP switch settings. The
opener has three screw terminals, marked 1/2/3 from left to right.
So I'm trying to figure out if I can use the opener's juice (I'm
pretty sure it's terminal 3) to supply the "24V" supply of a Genie
Intellicode conversion kit I got at Home Depot. The kit came with a
nominal 24V AC transformer, although I measured the output at 27.5V
AC with a multimeter. The closest outlet is on the garage ceiling,
and I'm not looking forward to rigging wire all the way across the
ceiling. I think I could plug in the transformer on the ceiling, but
the weight seems a bit much, and I don't want it dropping on a car.
The opener says 27V on the side although I'm not sure if it's AC or DC.
I do the same thing, but the proper way to measure the voltage is when
it is in use. It's probably a lot closer to 24 volts then.
And a couple volts one way or the other from 24 usually don't make
Put some sort of strap around it, or make a short extension cord so
that the transformer can rest on the opener, and only a plug and some
wire will be stuck in the outlet.
I hate when they do that. And various companies do it a lot. If it
were DC, it should say which contact is negative, so that means it
wants AC.... but again, sometimes they don't do even indicate
polarity. I guess they are trying to teach people they have to use
the transformer made by the company, but of course sometimes that is
Have you checked with Genie? But since their kit puts out AC, it
seems likely that the opener also wanted AC.
I thought of that already. I was thinking of maybe wrapping a light
duty extension cord around the door opener mount, and attaching the
transformer to the top with mounting putty or adhesive backed foam.
The instructions don't recommend placing the receiver on the opener,
but I never had a problem with the Chamberlain receiver falling off.
Securing it with adhesives should help.
I guess they included the transformer because not all openers have a
suitable supply built in. I'll find out when I get there. The
instructions actually have one of the AC transformer terminals wired
to what looks to be ground. The same receiver terminal is wired to
the switch connection and the transformer.
I've already played around with it at home and got the remotes to
work. I didn't have it hooked up to an opener, but I heard a
noticeable clicking of the relay. I also played around with all
various settings, including clearing the receiver of all transmitter
programming (should be useful for the next tenant). I got a three
button keychain remote that operates up to three different openers.
It seems that if I reprogram another button for the same opener, other
buttons previously programmed to a receiver cease to work on that
I don't think so. It really seems like the transmitter (maybe
receiver?) locks out the other buttons. It looks like the
transmitters can only "learn" one button/transmitter at a time.
I'll just program it to the big button anyways. This keychain-sized
transmitter only has one largish button that's easy to press. The
other ones are about a 2 mm wide circle and a 2x4 mm wide oval. It's
the "3 Button Mini Transmitter" - model GMI-3. The two small buttons
seem way too tiny for normal sized hands to press reliably.
I'm pretty sure opener terminal 1 was ground. The terminal had a
metal strip that was riveted to the metal base. I checked the AC
voltage between terminal 3 and ground, and got 80+ V. I couldn't get
it to measure a DC voltage. At that point I figured out I should
avoid anything that might cause my heart to stop, unplugged the
opener, and decided to just use the transformer. I don't know if my
multimeter was accurate, because it seemed excessively high and it
didn't kill the previous transmitter.
That's exactly what I did. I had an extension cord in my car, which I
wrapped around the mount. After I had everything installed, I went
out and got some foam mounting squares to keep the receiver and
transformer fixed to the opener.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.