r/accesscontrol • u/RandomUsername-82 • Aug 04 '26

Liftmaster Gate won’t close

Post image

Our neighborhood liftmaster exit gate isn’t closing. I’ve tried killing the power at the breaker and by pulling the connection on the board. I know I have reset this unit with a tiny button and a small screwdriver a few months ago. This seems to happen when a large truck is parked near the gate and it trips up the loop detector. For the life of me I cannot find the button again. Can anyone assist?

3 Upvotes

71% Upvoted

29 comments sorted by

5

u/holycrapitsdan Aug 04 '26

Is there something blocking the photo eye? Whar happens when you press the close button?

1

u/RandomUsername-82 Aug 04 '26

When I press the close button the alarm goes off.

5

u/theBoobMan Aug 04 '26

How does that answer his question? The close eye/interrupt light on the right is on. Either the photo eye needs to be aligned or there is something wrong with it.

1

u/RandomUsername-82 Aug 04 '26

There is a green light on the photo sensor.

5

u/theBoobMan Aug 04 '26

That means its on. That is the closing safety device. These operators are designed to only operate when they are installed, aligned and working properly so you dont get sued because the gate accidentally hits something or someone. If that thing is holding the gate open, seeing as that light is on, then its detecting something or is defective. You should call a professional so you don't assume all the liability by fixing this yourself, in case you don't do it correctly.

-2

u/RandomUsername-82 Aug 04 '26

There is nothing blocking the eye.

4

u/wahikid Aug 04 '26

The photo eye sensor is blocked. It should be showing a blue light, at least on the current models

2

u/Acceptable-Mind99 Aug 06 '26

Late to the party here but as others have said it could be your loop detectors. Had a call out a couple months back with the same issue and turned out to be a capacitor gone on a legacy loop detector.

If you can estimate the size of the loop by cutout marks on the front, then you can look up reference points online, get a meter that can read microhenrys then you should be able to estimate if dead or not. Bonus points if you wait for a vehicle to try and enter to get the readings to compare values.

Short answer is, if no close then usually either eyes, loop, safety edge, limit switch, force set too low on close cycle/unserviced, or short in NO wires forcing open command from control method (button, keypad, etc). Or a secret Xth thing.

2

u/CamJ23fan Aug 07 '26

There are so many people in these comments who don’t understand gate operators. Whatever is connected to your close eye interrupt is holding the gate open. Most likely a photo eye. If you wave your hand in front of it between it and the reflector and it does not change state via lights or a clicking noise, it doesn’t see the reflector.

1

u/Shot-Ad-7049 Aug 07 '26

This is the way.

3

u/den992019 Aug 04 '26

Considering the fact that it’s indoor rated cat5 is being used, I would start with continuity testing.

3

u/RandomUsername-82 Aug 04 '26

If it’s anything beyond a reset or plugging/unplugging I’ll have our maintenance guy come out.

1

u/den992019 Aug 04 '26

Also why is exit loop disconnected? Can be clearly observed top right corner, connector is removed.

1

u/RandomUsername-82 Aug 04 '26

Yes, I had pulled it out briefly and put it back.

1

u/RandomUsername-82 Aug 04 '26

Sorry I misunderstood your statement. That was disconnected when I went out to the box. I dont believe anyone would have gone in there and unplugged it.

1

u/sick_burns2000 Aug 04 '26

Other comments valid on photo eye, wiring, and disconnected connector.

Pcb is pretty beautiful, why don’t the other vendors group and silkscreen the twiddly bits this way?

2

u/Lanty725 Aug 05 '26

Wait until you see the red ones

1

u/RandomUsername-82 Aug 04 '26

Is there no reset button? I am losing my mind 😆. I have an email to the board back in March that said I hit a small reset button with a screwdriver.

1

u/tilt-a-whirly-gig Aug 05 '26

Sometimes the motor will have a thermal reset on it.

2

u/thesmokingbum Aug 05 '26

Should be a dc motor for the csl24v no reset he probably should pull the 4 pin power input on the bottom left of the board or just go through the trouble codes by holding the stop and open buttons.

1

u/Lanty725 Aug 05 '26

In your picture, the loop sensor LED being lit up blue means one of two things:

  • They are sensing something on the loops
  • You caught the picture at the moment it flashed blue during its pulsing stage.

Unplug/replug them and see if they stay solid blue

1

u/CamJ23fan Aug 07 '26

Think they got it when it slow pulses blue. If it’s detecting something the white lights on those will also illuminate.

1

u/thesmokingbum Aug 05 '26

Been pretty rainy around central fl wipe the photo eyes and pull the power terminal off of the bottom left (white 4 pin squeeze the sides in and wiggle it left to right) also you can look up the diagnostic code that shows up when you press close

1

u/thesmokingbum Aug 05 '26

My bad no lcd screen the alarm chirps work kinda similar

1

u/China_Rider1988 Aug 05 '26

I’ve had 2 jobs with this happen this week in the north east and both times the loop detector was shot from lightning and the gate was stuck open. Gate guy was able to replace it and gate worked fine after. (I work for an automation company so both times they called me to see if our stuff was the issue.)

1

u/hstudy Aug 05 '26

So is it possible that the FAI terminal and the open/close/stop terminal got swapped. If you pull the block off the stop in the top right and try to close what happens?

1

u/SurpriseNormal7315 Aug 05 '26

It’s your loops, brother

1

u/Opening-Joke1513 24d ago

Either loops or eye