Liftmaster 8550C

[maguire]

I am having some issues gettign the VCRX to successfully open a garage door. It's a Liftmaster 8550. It is wired in parralel with the on-wall openers that came with the Liftmaster, but we have tried taking this setup out of the equation, and directly wiring the VCRX without the parralel wiring, and a button press on VCRX doesn't always result in the contact closure actually making the garage door open and close.


Anyone had this same issue?

www.liftmaster.com/lmcv2/pages/productmodeldetail.aspx?modelId=8186

[Ryan]

I'm having the same issue and haven't found a solution yet. I'd be interested in knowing what the work around is!

[maguire]

Interestinly, Even when I had just the two LV wires haning out of the wall, I couldnt get it to always react upon touching the two wires together..

I am beginning to suspect the garage door unit, not our gear.

[hanshi]

I am thinking that this is because the opener is more than simply a contact closure for this series of LiftMaster. In other words, there might be some sort of proprietary digital two wire communication, perhaps some form of differential communication, as opposed to a simple switch closure and thus our gear may not be a direct drop in, at least for where these two wires are running. I am not familiar with the electrical connections of those systems but perhaps there is some sort of alternate, contact closure input. I do know that this series of LiftMaster uses a couple of proprietary communication methods and is not even directly HomeLink compatible without some sort of adder.

[feenypower]

I had some similar problems with this system. Messing with the maintained timing worked but when the Lutron system shorted the contacts on the motor it killed power to the wall units for a split second and reset the clock. There is some sort of digital communication on this two wire system that is broken when fully shorted. My solution was to purchase a wireless wall controller from Liftmaster. I took it apart and soldered leads to the push button terminals on the board and the power terminals. I added a 6v ? (can't quite remember) transformer so it wasn't dependant on battery power and terminated the switch leads to the VCR-X. The VCR-X would 'push' the button on the wireless wall controller and engage the motor as the manufacturer intended. I mounted the wall controller in the same spot I hid my VCR-x.

[Patricia]

My remote does work properly after open/close garage door 6 times. Reprogrammed twice and will try unplugging and reprogramming again, Any other suggestions?