There is a particular kind of gate problem that people live with for weeks.
The gate opens fine. You press the remote, it swings or slides out of the way, you drive through. Then it sits there. It does not close behind you. Maybe it tries, gets partway, and reverses. Maybe it does not try at all.
Nothing is stopping you from going about your day, so you go about your day.
The gate you can still drive through is the one that gets ignored
A gate that will not open is an emergency. You are standing in your own driveway and you cannot get in, so you call somebody that morning.
A gate that will not close is the opposite. It costs you nothing in the moment. Everything still works from where you are sitting.
What you have actually lost is the entire reason the gate is there. An open gate is a fence with a gap in it. For a home that means anyone can walk up the driveway. For a commercial yard it means the equipment, the vehicles and the materials behind that gate are sitting in an unsecured lot, usually overnight, usually without anyone having decided that was acceptable.
So this is the failure worth calling about the same day, even though it feels like the one that can wait.
Most of the time, the gate is not broken
Here is the part that surprises people.
A gate that refuses to close is very often a gate doing exactly what it was built to do.
Every automated gate has safety devices watching the area it moves through. Photo eyes send a beam across the opening. Safety edges sense contact. Loop detectors watch for a vehicle sitting in the path. These are not accessories. On any gate that meets current safety standards they are required, because a gate closing on a child, a pet, or a car is the thing the whole system exists to prevent.
When one of those devices reports that something is in the way, the operator will not close. It is not confused. It has been told the path is blocked and it is refusing to move, which is correct behavior.
The problem is that the device does not have to be right. It only has to think it is right.
What we check first
In rough order, because the cheap and common causes deserve to be ruled out before anyone opens a gearbox.
- Dirty photo eye lenses. Dust, road grime, pollen, cobwebs. A spider building a web across a lens is not a joke, it is one of the more common causes we find.
- Misaligned photo eyes. They are mounted in pairs and they have to point at each other. A delivery truck, a landscaper’s mower, a bumped post, or frost heave over a winter will move one a few degrees, which is enough.
- Low sun. In the Pacific Northwest, a low autumn or winter sun sitting directly behind a receiver can blind it for twenty minutes a day. On east-facing driveways in Redmond and Issaquah we see this most in October and November. If your gate only misbehaves at one time of day, tell us that, because it points straight at the answer.
- Something actually in the path. Gravel washed into the track, a fallen branch, a trash can, ice. Sometimes the sensor is right.
- Safety edge or loop fault. A damaged edge sensor, or a loop detector still reading a vehicle that left an hour ago, will hold a gate open indefinitely.
- Water in a keypad, splice, or conduit. Moisture gets into a connection and shorts an input. The operator reads that as a permanent signal. We see this most after the first real storm of the season.
- Limit switches that have drifted. These tell the operator where closed actually is. When they move, the gate can stop short, close hard, or decide it has already arrived.
- The control board. Operators log faults, and the board will often tell a technician exactly where to look before anyone picks up a wrench. On a commercial unit it is the first thing we read.
- Power interruption. After an outage, some operators come back in a state that needs a reset before they will run a full cycle again.
What you can safely check before you call
None of this requires tools, and any of it might save you a visit.
- Look at the lenses. They are usually small round or rectangular eyes mounted low on each side of the opening. Wipe both with a clean dry cloth. If one has an indicator light, note whether it is on, off, or blinking, and tell us.
- Walk the path. Look for anything in the track or the swing arc, including the things that are easy to look past, like a flattened box or a build-up of bark and gravel.
- Notice the pattern. Does it fail every time, or only in the morning, only in the rain, only after dark? A gate that fails on a schedule is telling you something specific.
- Think back a week. Was anyone working on the property? Landscaping, deliveries, paving, a contractor backing a trailer in? Most misalignment has a cause, and somebody usually remembers it.
Write down what you find. Ten seconds of that on the phone routinely turns a diagnostic visit into a repair visit.
The one thing not to do
Do not disable, unplug, cover, or tape over a safety sensor to make the gate close.
It works. That is the problem. The gate closes, the annoyance goes away, and what you have done is remove the device that stops several hundred pounds of moving steel from closing on whatever happens to be in its way. Gates are heavy, and they do not sense what they cannot see.
If somebody has already done this on a gate you own, and it turns up more often than you would think on properties that have changed hands, that is worth a call by itself. We would rather find it than have it find you.
When it is not the sensors
Sometimes the safety system is fine and the gate genuinely cannot finish the job.
Drive components wear. Chains and belts stretch, pulleys lose their grip, and a gate that has been getting slower for a month finally cannot make it to the closed position. Hardware loosens, hinges develop play, posts settle, and the gate starts dragging against its own frame. The operator senses the resistance, reads it as an obstruction, and stops.
That kind of failure is the visible end of a long slow process, and it is exactly the kind a maintenance visit catches months earlier. We covered what that visit actually includes in our last post.
Do not leave it open overnight
If your gate will not close, you are unsecured until it does, and that is true whether the cause turns out to be a cobweb or a worn drive belt.
Call us at (425) 881-3554. Tell us what the gate does, when it does it, and what you saw on the lenses. We repair automated gates and access control across the Puget Sound region, Redmond and Issaquah included, along with the rest of our service area. Most of what we fix is a gate that worked fine right up until it quietly stopped.
