Garage door opener repair and installation
We repair, replace and safety-test residential garage door openers across Hamilton, Stoney Creek, Grimsby, Burlington and Niagara, and we are an authorized dealer for Chamberlain and LiftMaster. Every job ends with the entrapment protection tested, because an opener that does not reverse is not a working opener.
Start here: is it the opener or the door?
This is the question that decides whether you need a repair or a new motor, and it is worth two minutes before you spend anything.
Pull the red release cord with the door fully closed, then lift the door by hand. If it lifts smoothly with moderate effort and stays put around waist height, the door is balanced and the fault really is in the opener. If it is heavy, binds, or slams back down, the problem is the counterbalance, and no opener will fix it. Fitting a stronger motor to a heavy door just moves the failure from one part to another.
What the symptom usually means
The door starts down, then goes back up
Almost always the photo eyes: misaligned, dirty, or with something in the beam. This is the opener doing exactly what it is designed to do.
The motor hums but nothing moves
On a chain or belt drive, usually a stripped drive gear or a failed trolley. On some units it is a failed capacitor. Both are repairs, not replacements.
The remote works, the wall button does not (or the reverse)
A wiring or wall-control fault if the button is dead; a receiver or battery fault if the remote is. Two different repairs, and cheap to tell apart.
It works from the wall but not from the car
Range loss. Often a failing logic board or interference from a new LED bulb in the opener itself, which is a genuinely common and genuinely annoying cause.
It runs, then reverses part way down
The force setting has drifted, or the door is binding on the way down. If it is binding, that is a door problem, not an opener setting to turn up.
The chain or belt is slack and slapping
Tension adjustment. Cheap, quick, and it stops the noise that made you call.
The safety system, and why we will not defeat it
Residential garage door operators sold in Canada are listed to ANSI/CAN/UL 325, which requires features that help prevent someone being trapped under a closing door. One way of meeting that is an external entrapment protection device: a photoelectric sensor, an edge sensor, or another system that passes the standard's test.
Source: DASMA Technical Data Sheet #364, Installation Location of Photoelectric Sensors on Residential Garage Doors (PDF). Checked 31 August 2026.The same document is specific about where the eyes go. Each photoelectric eye lens, or the lowest lens where there is an array, must emit a beam no higher than six inches above the garage floor. Sensors are usually placed up to twenty feet apart, and should sit within six inches of the path of the door measured perpendicular to it.
If a previous installer tie-wrapped your sensors to the ceiling, taped them facing each other on a shelf, or bridged them so the door closes without them, that is not a working safety system and we will put it back where it belongs. It is also the first thing a home inspector looks for.
Two tests, every month, and they take a minute
DASMA asks homeowners to run both of these monthly on a residential opener:
- The photo eye test. Start the door closing, then put an obstruction through the beam. The door must reverse and return to fully open.
- The reversing mechanism test. With a solid object about one and a half inches high on the floor in the door's path, close the door. On contact it must reverse.
DASMA's home-inspection checklist calls for a one-and-a-half-inch solid object, such as a piece of two-by-four at least six inches long, for exactly this test.
Sources: DASMA TDS-364 (monthly testing) and TDS-167, Residential Sectional Garage Door and Electric Operator Checklist for Home Inspectors and Consumers (PDFs). Checked 31 August 2026.If either test fails, stop using the opener and call. Full detail, including what a blinking sensor LED is telling you, is on the safety sensor guide.
Repair or replace
Openers are worth repairing far more often than people expect. A drive gear, a logic board, a wall control, a set of sensors or a trolley are all standard parts. Replacement makes sense when:
- The unit predates modern entrapment protection, or has no photo eyes at all.
- Parts for that model are no longer made, which is common past roughly twenty years.
- You want a rated horsepower that matches a heavier insulated door you have just fitted.
- The noise is the complaint: a belt drive with a DC motor is dramatically quieter than an old chain drive, which matters when there is a bedroom over the garage.
What a new opener install includes
Mounting the unit and its rail, hanging it properly off the structure, running the wiring, fitting and aligning the sensors, setting the travel limits and force settings, programming the remotes and keypad, and testing both safety functions before we leave. DASMA publishes a standard pre-wiring layout for residential openers, which is what a new-build electrician should have followed; where the wiring is wrong we will tell you what it needs rather than working around it.
Source: DASMA Technical Data Sheet #362, Residential Garage Door Operator Pre-Wiring Diagram (PDF). Checked 31 August 2026.One detail that catches people out: the header bracket and the ceiling hangers have to land on structure, not on drywall. DASMA has a data sheet on exactly this, because drywall on its own will not hold the loads an opener puts into it.
Source: DASMA Technical Data Sheet #164, Drywall Surfaces and the Mounting of Garage Door Hardware (PDF). Checked 31 August 2026.