You press the button and nothing happens. Or the opener hums but the door doesn't move. Or the door reverses before it closes completely. Each symptom points to a different problem — and most of them are diagnosable without calling anyone. This guide walks through the most common causes in the order you should check them, from the simplest fix to the ones that need a professional.
Step 1: Check the Power Supply
Before assuming the opener itself is broken, confirm it has power. This sounds obvious, but tripped breakers and unplugged units are genuinely the cause in a surprising number of "opener not working" calls.
Verify the opener is plugged in and has power
- Check that the opener unit is plugged into the ceiling outlet — sometimes the plug gets knocked loose during a power surge
- Look at your electrical panel for a tripped breaker labeled "garage" or "GFCI"
- If the outlet is GFCI-protected, look for a GFCI outlet on the garage wall with a "reset" button and press it
- Plug something else (a lamp, phone charger) into the same outlet to confirm it has power
If the opener has power but does nothing — no sound, no light — the logic board or motor may have failed. If it hums but doesn't move, skip ahead to the spring section.
Step 2: Diagnose the Remote or Keypad
If the opener activates fine from the wall button but not the remote, the problem is the remote — not the opener itself.
Test and fix the remote
- Replace the battery first. Most remotes use a CR2032 or similar coin cell. Battery failure is the #1 remote issue.
- Stand within 5 feet of the opener unit when testing — if it works close but not from the driveway, the remote antenna may be damaged or the frequency is being interfered with
- Check if the antenna wire hanging from the opener unit is intact and hanging straight down (not coiled or tucked up)
- Try reprogramming the remote: most openers have a "learn" button on the unit — press it, then press the remote button within 30 seconds
- If you recently replaced the opener or remote, check that both are compatible (LiftMaster, Chamberlain, and Craftsman use the same Security+ 2.0 protocol; others may not)
LED bulbs and interference: Standard LED light bulbs in the opener unit can emit radio frequency interference that blocks remote signals. If your remote stopped working after you changed the bulb, try an opener-specific LED bulb (LiftMaster and Chamberlain make them) or go back to incandescent.
Step 3: Check the Safety Sensors
Every garage door opener made after 1993 has photoelectric safety sensors near the floor on each side of the door opening. They project an invisible beam across the opening. If the beam is blocked or misaligned, the opener won't close the door — this is the most common reason a door closes partway, then reverses.
Diagnose sensor issues
- Look at both sensor units (the small boxes mounted on the tracks, about 4–6 inches off the floor). Each should have a steady indicator light — one sends, one receives.
- Blinking or no light: The sensors are misaligned or the receiving sensor isn't picking up the beam. Loosen the wing nut on the receiving sensor (the one that blinks), realign it so the light goes solid, and retighten.
- Check for obstructions: Something in the path of the beam — a cobweb, a piece of packing material, even direct sunlight hitting the sensor — will block it.
- Check the wiring: The sensor wires (typically white and white/black) should be intact from sensor to opener unit. A kinked, pinched, or rodent-chewed wire will cause intermittent failures.
- Wipe the sensor lenses with a dry cloth — dirt buildup causes false blockage readings, especially in dusty garages.
If both sensor lights are solid but the door still reverses, the opener's auto-reverse force setting may be set too sensitively. This is adjustable on most openers via small dials or screws on the unit labeled "up force" and "down force." Consult your opener manual before adjusting — too little sensitivity creates a safety hazard.
Step 4: Rule Out a Broken Spring
When an opener hums but the door doesn't move, the most common cause isn't the opener at all — it's a broken spring. The opener's motor cannot lift the full weight of a garage door without spring assistance. When the spring fails, the motor strains and makes noise but the door stays put.
Do not force it: Repeatedly pressing the opener button with a broken spring will burn out the motor. If the door feels extremely heavy when you manually try to lift it (disconnect the opener by pulling the red emergency cord), stop and call a professional. See our spring replacement cost guide for what to expect.
To check: pull the red emergency release cord hanging from the opener track. This disconnects the door from the opener. Try lifting the door manually. A door in good spring balance should feel nearly weightless and stay up on its own at the halfway point. If it feels heavy and drops when released, the spring is broken or failed.
Step 5: Inspect the Track and Hardware
A door that moves but makes grinding or scraping sounds, or that moves unevenly, usually has a track or hardware problem.
Visual track inspection
- Look along both vertical and horizontal track sections for visible bends, gaps, or kinks. A bent track prevents smooth roller travel and can cause the door to jam or come off the track.
- Check that all track mounting bolts are tight. The tracks should not flex or move when you push on them.
- Look at the rollers — the small wheels that run inside the track. Cracked, worn, or wobbly rollers cause binding and noise. Nylon rollers typically last 10–15 years; steel rollers with sealed bearings last longer.
- Check the cables running from the bottom corners of the door up to the spring drum. If a cable is frayed, off its drum, or hanging loose, do not operate the door. This is a professional repair.
Minor track misalignment (the track not being plumb) can sometimes be corrected by loosening the mounting bolts, adjusting the track, and retightening. Anything involving bent tracks, broken cables, or rollers off-track should go to a professional.
Step 6: Consider Opener Age and Replacement
If the opener is more than 12–15 years old and requires repeated repairs, replacement is usually the smarter financial decision. Modern openers offer:
- Battery backup: Door operates during power outages — increasingly useful in Massachusetts with storm-related outages
- Wi-Fi connectivity: Open/close monitoring from your phone, alerts if the door is left open
- Quieter operation: Belt-drive openers are significantly quieter than older chain-drive units, important for attached garages
- Security+ 2.0 rolling code technology: Eliminates the signal replay vulnerability in older fixed-code openers
| Opener Type | Best For | Typical Installed Cost (MA) |
|---|---|---|
| Chain drive (1/2 HP) | Detached garages, budget installs | $250–$380 |
| Belt drive (3/4 HP) | Attached garages, quiet operation | $320–$480 |
| Direct drive (all-in-one) | Low-maintenance, ultra quiet | $380–$550 |
| Jackshaft (wall mount) | High-lift or low-ceiling garages | $450–$650 |
Request a professional assessment if you're not sure whether repair or replacement makes more sense.
When to Call a Professional
DIY is appropriate for: replacing remote batteries, reprogramming remotes, cleaning sensor lenses, and light lubrication. Everything else on this list — springs, cables, logic boards, track repair — benefits from professional service.
The diagnostics above will help you describe the problem accurately when you call. That matters: a technician who knows "the door reverses at the halfway point with solid sensor lights" arrives ready to check force settings and mechanical obstruction instead of starting from scratch.
We serve Quincy, Braintree, Weymouth, Hingham, and surrounding South Shore towns. Check our verified reviews. Same-day service available for opener failures. Call (781) 222-DOOR or submit a service request online.