Garage door remote control constantly transmitting??

I doubt it's a stuck remote. It sounds more like a bad limit switch.

The remotes should have an FCC ID number on them. You can use this to determine the RF frequency at the FCC web site.

Then, depending on the frequency, you can perhaps get an inexpensive RF receiver module that you can use to tell whether anything is continuously transmitting.

Are you near a military base? There have been frequent >My condo building has a gated underground garage. All owners have a

Make sure the obstacle beam "windows" are clean and the beam is properly aimed at the sensor on the opposite side of the door opening. The problem symptom is typical for dirty beam sensor windows.

Depending on the design of the housing for the sensing device, disassembly may be required to clean both sides of the beam windows.

The intermittent problem you describe sounds like a stuck remote button to me & is a quite common occurance. The eyes won't tell the gate to close & if they thought something was blocking them the gate would simply stay fully open the same way as putting tape over them. The most likely reasons it stops on its own sometimes is the stuck transmitter leaves the bldg or because the transmitter battery will go dead quite quickly when the button is stuck.

You stated that it is the repairman's "theory", which sounds like the door works fine while he is there. If it wasn't he would be able to prove whether it was fact or fiction. So if the gate works fine when he is there, either the stuck transmitter isn't in the building or it has a dead battery. Obviously a repairman (or anybody else) can't find a transmitter that isn't in the building & the only way to find one w/ a dead battery is to open every car and check every transmitter.

It may also be more then one transmitter that is causing the problem at different times & there are some brands of remotes that stick more easily then others.

Yes you could change the code to determine if that was the problem or you could simply disconnect one of the receiver wires. However in either case nobody will be able to open the gate at all during that time, so you won't be able to leave it that way for very long.

Yes there is hand held electronic equipment that could find the stuck transmitter by showing the signal strength as you walk around the building but obviously the transmitter has to be there to find it.

It's probably not going to matter which cars were in the building before the problem occurs. When it occurs, the problem source will be in the car that just entered the building. However, personally instead of watching the comings & goings of your neighbors (infringing on privacy) I would recommend that you put out a memo (as in newsletter, email, etc that you normally use) or something to the owners stating the problem & explain that if they are chaning their remote battery quite often then their transmitter is probably causing the problem. You should then ask them to bring in the remote so it can be checked to see if it can be repaired or if it needs to be replaced.

Doordoc

Most power gates have a sensor to detect if the gate is hitting an object, such as a person or car. If there's too much resistance as the gate slides or swings it will reverse. On modern gate operators there's an adjustment to set the sensitivity of the sensor. Chances are all you need to do is adjust it a bit.

Note: If it was a stuck remote, the thing would not respond to any other remote at the same time.

Stuck remotes are unpredictable and difficult to diagnose. I lived in a condo building with a common door that was permanently stuck. The culprit turned out to be a stuck remote in a parked car.

Some remotes will transmit continuously when stuck and others will send their salvo of coded pulses and then either shut off or send continuous carrier which can sometimes jam the receiver.

We had a big issue of one crabby owner who refused to let us check the inside of his car for a stuck remote, which contributed greatly to the problem.

Beachcomber

There are two different methods for reversing an overhead door or gate when it hits an obstruction. They're distinctly separate. One employs a strip down the underside of the door/gate that causes it to reverse if it hits something, and the other employs a resistance sensor at the motor that accomplishes much the same thing but isn't as effective (it's used on older model doors and most single family homes because it's "cheaper"). A second safety device using an infrared beam detector will prevent the door from closing if anything is parked or blocking the beam. Have a qualified door installer check the travel of the unit from full open to full closed. He'll do this with the shuttle disengaged from the door. Sometimes one of the rollers gets jammed which may cause enough resistance during the closing cycle to engage the sensor or the spring may require adjustment. Both will cause the door to cycle as you describe. A stuck remote won't (at least it doesn't with my five Craftsman openers).

Get a few spare remotes, ask people to come trade in their remote. Rotate them out and see which one(s) cause the trouble. Dunno if it's possible but see if you could rig-up a second RF receiver and use a new code. That way you could configure all the rotated-out remotes with a new code and shut-off the old one after some set (and notified) period of time.

-Bill Kearney