If your opener has ever refused to close from the remote, bounced back up for no obvious reason, or beeped and flashed before closing from your phone, it was most likely following a safety standard, not breaking down. That standard is UL 325. This guide explains what the UL 325 garage door opener rules require, how they apply in Canada and BC, and how each rule shows up in the way your opener behaves. If you want to fix a sensor problem, our safety sensor troubleshooting guide covers the hands-on steps. This page covers the reasons behind them.
What UL 325 is, and how it applies in Canada
UL 325 is the "Standard for Safety for Door, Drapery, Gate, Louver, and Window Operators and Systems." It covers garage door openers, commercial door operators and gate operators. Its entrapment rules exist because closing doors trapped and killed people, children especially, before reversing systems were required.
The US federal rule
In the United States, the entrapment parts of UL 325 are law. The Consumer Product Safety Improvement Act of 1990 directed the Consumer Product Safety Commission to adopt them, and the result is 16 CFR Part 1211. Section 1211.1 says the standard "applies to all residential garage door operators manufactured on or after January 1, 1993 for sale in the United States." The CPSC updates the rule when UL revises the standard. A notable update took effect May 9, 2016, adding requirements for unattended (app and timer) closing and wireless sensors. DASMA, the door manufacturers' association, notes in Technical Data Sheet #351 that automatic reverse was required on openers made from January 1, 1991, and secondary devices such as photo eyes from January 1, 1993.
The Canadian picture
Canada long had its own standard for door and gate operators, CSA C22.2 No. 247 ("Operators and systems of doors, gates, draperies, and louvres"). UL describes CSA C22.2 No. 247 and UL 325 as the historical standards for the two countries. On May 19, 2017, UL published ANSI/CAN/UL 325, combining the requirements into one binational standard for the US and Canada. UL reports that the 2018 Canadian Electrical Code (CSA C22.1-18) lists ANSI/CAN/UL 325 among its referenced product safety standards. Current DASMA data sheets refer to the standard by that binational name.
We could not find a Canadian law that copies 16 CFR 1211 word for word. In BC, the legal requirement is that electrical equipment carries a certification mark from an agency accredited by the Standards Council of Canada. Technical Safety BC points to section 21(1) of the Electrical Safety Regulation. Garage door openers are certified to the operator standard, so in practice the openers sold here for Canadian homes are built to UL 325 rules. That is also why an opener bought across the border may still need a Canadian certification mark before it can be installed here.
The UL 325 garage door opener rules, one at a time
Here are the requirements that matter to a homeowner, taken from the text of 16 CFR 1211 and DASMA's technical data sheets.
1. Contact reversal within 2 seconds
Every opener must have built-in ("inherent") entrapment protection. Once the door has travelled past the first foot down from fully open, it must start reversing within 2 seconds of hitting an obstruction, then go back to fully open. In the federal test, the obstruction on the floor is a solid object 1 inch high. For homeowners, the manuals and DASMA describe testing with a 1-inch or 2-inch block, often a 2×4 laid flat under the centre of the door. Follow your manufacturer's instructions. LiftMaster's manuals, for example, specify a 1-1/2 inch object or a 2×4 laid flat.
2. Position monitoring or a 30-second timer
The opener must also either track the door's position in steps of 1 inch or less and reverse if the door stops behaving as expected, or reverse if the door hasn't reached the closed position within 30 seconds. This is why a door that drags or binds in its tracks can reverse partway down even when nothing is in the way. The opener "feels" a change from its learned profile and backs off.
3. Secondary protection, and it must be monitored
On top of contact reversal, a vertical door opener needs a second layer. The most common is a pair of photo eyes. Edge sensors on the bottom of the door, or an approved built-in system, also qualify. The alternative is "constant pressure" operation, where you have to hold a control within sight of the door the whole way down, and handheld remotes can only open.
The key word is monitored. Section 1211.8(c) requires the opener to check that the sensor is present and working "at least once during each close cycle." If the sensor is missing, misaligned, unplugged, or its wire is cut or shorted (including a lost signal on wireless sensors), the opener must either:
- reopen a closing door, and not let an open door travel more than 1 foot down from the top; or
- fall back to constant-pressure operation.
That rule explains two of the most common complaints. "The remote won't close the door, but the light clicks" means the opener can't see a working sensor. "I can close it if I hold the wall button down" is the constant-pressure fallback. LiftMaster's owner's manuals describe exactly this: with the sensors missing or misaligned, the door won't close from a remote, but holding the door control or keypad button until it's fully closed will work.
4. Where the photo eyes must sit
DASMA Technical Data Sheet #364 says the photo-eye beam must be no higher than 6 inches above the garage floor, and the sensors should be within 6 inches of the door's path. Some people mount the eyes higher so they won't get kicked or rained on. That defeats the purpose, because the beam is meant to catch a small child or a pet lying on the floor.
The federal rule also requires:
- a visual indicator, such as the small LED on each eye, to show alignment (section 1211.10(a)(5));
- a splash test for any sensor mounted 3 feet or less above the floor, so it has to keep working after getting wet;
- an interference test in which a 500-watt flood lamp is aimed at the receiver from 5 feet away at a 15 to 20 degree angle. This is why sensors are built to resist bright light. Even so, LiftMaster's installation steps say the receiving sensor lens should not get direct sunlight, which matters when low winter sun shines straight into a garage.
5. Closing from your phone or on a timer
Closing a door when nobody is standing in the garage is called "unattended operation." Since the 2016 update, section 1211.14 allows it only if:
- you take an intentional step to turn the feature on, such as setting it up in the app or flipping a switch;
- the opener sounds an audible alarm and flashes a light for at least 5 seconds before the door moves. The rules call for at least 45 dB at 10 feet and a light of at least 360 lumens;
- pressing any wall control, remote or keypad during that warning cancels the close;
- the door is a sectional door. Unattended closing is not allowed on one-piece (tilt-up) or swinging garage doors.
So the beeping and flashing before your door closes from the app is required, and it can't be turned off. If you have a one-piece tilt-up door, an app-close feature should not be enabled on it.
6. Wall button and release handle height
The installation instructions required under the federal rule say to mount the wall control within sight of the door, at least 5 feet above the floor so small children can't reach it, and away from moving parts. The emergency release handle should be within reach but at least 6 feet above the floor. DASMA TDS #384 notes that UL 325, the manufacturer's instructions and US federal law all keep the 5-foot minimum. If a homeowner wants a lower button for accessibility, DASMA suggests a remote, keypad or app instead, and recommends a written sign-off if the button is mounted lower anyway.
Why your opener does that: a quick reference
| What you see | The rule behind it |
|---|---|
| Remote won't close the door, but it opens fine | Sensor monitoring: no valid photo-eye signal, so closing is blocked (1211.8(c)) |
| Holding the wall button closes it | Constant-pressure fallback (1211.6(b)(1)) |
| Door goes down a few inches, then right back up | Sensor fault caught during the close cycle, or the door left its learned profile |
| Door stops on the test block but doesn't reverse | Fails the contact-reversal rule. LiftMaster's manuals say to set the down limit closer to the floor and retest |
| Beeps and flashes before closing from the app | Required 5-second pre-motion warning for unattended close (1211.14) |
| App won't offer remote close on your door | Unattended close isn't permitted on one-piece or swinging doors, or the feature hasn't been enabled |
For the step-by-step fixes, see garage door won't close troubleshooting.
Old openers and the UL 325 garage door opener rules
An opener made before 1993 may have no photo eyes and no reliable contact reversal. DASMA's TDS #351 says to look for a label with a manufacture date on or after January 1, 1993 and either a listing agency logo or a statement that the unit meets UL 325 or federal standards. The same data sheet says no US federal law prohibits repairing an older non-compliant opener. DASMA does not support installing non-compliant products, though, and it recommends that technicians advise the owner in writing and suggest a replacement.
A few BC-specific points:
- There's no rule forcing you to replace a working older opener. But a unit with no photo eyes and a weak reverse is a real hazard if you have kids, pets or a car that parks close to the threshold.
- Never "jump" the sensor terminals or tape the eyes together to get around a sensor fault. You'd be disabling the exact protection the standard requires.
- The federal residential rule covers openers serving buildings of one to four single-family units. Commercial operators fall under building codes, electrical codes and job specifications instead, as DASMA TDS #384 explains. For strata parkade gates and shared doors, check our strata garage door service page.
If your opener is old enough to fail these checks, our guide on signs your opener is dying helps you decide whether to repair or replace it.
The monthly check DASMA recommends
DASMA TDS #364 calls for monthly testing of both the contact reversal and the photo eyes:
- Photo-eye test: start the door closing, then pass an object (a box or a broom handle held low) through the beam. The door should reverse and go all the way back up.
- Contact reversal test: lay a 1-inch or 2-inch block flat on the floor under the centre of the door, as your manual specifies, and close the door. It should reverse after touching the block.
- If either test fails, stop using the opener to close the door until it's fixed. Use the wall button and stand where you can watch the door the whole time.
A door that is heavy or out of balance can fail the contact test even when the opener is fine, so the springs are part of this check too.
If your opener fails either test, or you want an older unit checked against current UL 325 garage door opener requirements, call us at (778) 873-7282. New clients: 10% off labour on your first repair — mention NEW10 when you book (one per household/business, work booked by Dec 31, 2026).