How quickly can you come for an emergency repair?

We offer 24/7 emergency garage door service throughout South San Francisco and the Bay Area. In most cases, we can have a certified technician at your location within 1-2 hours of your call. We understand that a broken garage door is a safety and security issue, which is why we prioritize emergency calls. Our fully-stocked service vehicles allow us to complete most repairs on the first visit, getting your door working again as quickly as possible.

How much does a garage door repair cost?

The cost of garage door repair varies depending on the type of repair needed. Simple repairs like sensor adjustments or track realignments typically start around $89-$150. Spring replacements generally range from $150-$350 depending on the spring type and size. More complex repairs involving the door itself or opener mechanisms may cost $200-$500+. We always provide a free, upfront estimate before any work begins, so you'll never be surprised by the bill. We also offer financing options for larger repairs or new door installations.

Do you offer warranties on your work?

Yes! We stand behind all our work with comprehensive warranties. Labor is covered for 1 year on all repairs. Springs come with a lifetime warranty on parts (based on manufacturer specifications). New garage door installations include a 5-year warranty on installation and the manufacturer's warranty on the door itself (typically 10-25 years depending on the brand). Opener installations include a 2-year labor warranty plus the manufacturer's warranty. We're confident in our workmanship and want you to have complete peace of mind.

What areas do you serve?

We proudly serve South San Francisco and the greater Bay Area including . Whether you need emergency repairs, a new garage door installation, or routine maintenance, our certified technicians are ready to help. We offer same-day service in most areas and 24/7 emergency response throughout our service territory.

How long does a garage door installation take?

A standard garage door installation typically takes 3-5 hours for a single door and 5-7 hours for a double door. This includes removing the old door, installing the new door and hardware, setting up the opener, and testing all safety features. We complete most installations in a single day, so you can start enjoying your new garage door right away. Complex installations or custom doors may take longer, and we'll provide a time estimate during your consultation.

Should I repair or replace my garage door?

This depends on several factors including the door's age, extent of damage, and your budget. Generally, we recommend repair when the issue is isolated (like a broken spring or sensor problem) and the door is less than 15 years old. Replacement makes more sense when there's significant structural damage, multiple components are failing, or the door lacks modern safety features. During our free inspection, we'll provide honest advice on whether repair or replacement is the better investment for your situation.

Garage Door Photo Eye Safety in South San Francisco: Why It Fails and How to Fix It

2026-08-30 7 min read A2Z Garage Doors

In our years serving South San Francisco, we've seen this problem again and again: a photo eye sensor covered in dust, misaligned by an inch, or simply failed. The result? A garage door that no longer stops when it detects an object in its path. That's a crushing hazard waiting to happen, especially around children and pets.

The photo eye is your garage door's safety net. It's a pair of infrared sensors (one transmitter, one receiver) mounted on both sides of your door frame, about 6 inches off the ground. When the door closes, if anything blocks the beam, the door should reverse instantly. When that system fails, you lose your most critical auto-reverse protection. A 300-pound garage door descending on a child's arm or a pet is not a scenario anyone wants to experience.

How Photo Eyes Fail in South San Francisco Weather

Our coastal climate brings salt air, fog, and moisture that corrode sensor lenses faster than you'd expect. A thin layer of grime, spider webs, or condensation can block the infrared beam entirely. The sensors themselves may drift out of alignment after a few years of vibration and settling. Sometimes the wiring gets damaged by rodents or weather. Other times the receiver unit simply dies from age (typically 10 to 15 years for quality units).

I've walked into garages where homeowners didn't realize their photo eyes hadn't worked in months. They'd just been pressing the remote and letting the door fall. One family didn't notice until their toddler nearly got caught underneath. That conversation still haunts me.

Testing Your Photo Eyes Right Now

Start simple. Look for the small LED lights on both sensor units. When you press the door button, they should glow (usually red or green depending on the brand). If one light is dim or off, that's your problem. Next, walk between the sensors with your hand outstretched. The door should stop and reverse. If it doesn't, your auto-reverse feature is compromised.

Clean the lenses gently with a soft, dry cloth. Dust and cobwebs are the easiest fix. But if the lights don't come back on after cleaning, or if the door still won't reverse after testing, you need professional inspection. Don't assume it will work next time. It won't.

**Need garage door safety in South San Francisco today?** Call (650) 297-0859. we cover same-day service across the area.

Alignment Issues and Sensor Replacement

Even if both lights are on, misalignment can render photo eyes useless. The transmitter and receiver must be aimed at each other with laser precision. A shift of just half an inch breaks the beam. Weather, settling foundations, and impact damage all throw sensors out of whack.

If cleaning doesn't restore function, replacement is usually the answer. A pair of quality photo eye sensors costs between $150 and $300, depending on the brand and model. Installation takes 30 to 45 minutes if your wiring is intact. Cheap sensors under $50 often fail within a year. We recommend mid-range units from established manufacturers that come with warranties.

For a detailed breakdown of what you might spend, check our guide on getting an honest garage door repair estimate in South San Francisco. Photo eye replacement is one of the most straightforward repairs we handle, and same-day turnaround is almost always possible.

Why Child Safety Depends on Working Photo Eyes

Children are naturally curious. They run under closing doors, toss toys in the path, or stick their hands in at the last second. A working photo eye catches all of these scenarios and reverses the door before impact. A failed photo eye does nothing.

This is why we test photo eyes during every garage door safety check we perform. It's not optional. It's fundamental to preventing injury. If you have young children or grandchildren visiting regularly, photo eye function should be checked at least twice a year.

When to Call a Professional

Test your photo eyes monthly. Clean the lenses every other month, especially after fog or rain. If you see any of these signs, contact us right away: lights that won't turn on, door that won't reverse during testing, visible cracks on sensor housings, or loose wiring. Don't wait for the next close call.

Garage Door South San Francisco is equipped to diagnose and replace photo eyes on the same day you call. We serve South San Francisco and surrounding areas like Daly City and San Bruno. Our technicians can also check the rest of your door's safety features, including springs, cables, and auto-reverse mechanics.

Schedule your photo eye inspection and safety assessment today. Call (650) 297-0859 or contact us online to get a same-day estimate. A few minutes of preventive care now prevents a tragedy later. Your family's safety isn't something to gamble on.

Frequently Asked Questions

Q: Can I replace photo eyes myself? A: You can clean them and test them yourself. Replacement requires proper alignment and wiring knowledge. Misaligned sensors are worse than missing ones. We recommend professional installation to ensure they work correctly every time.

Q: How often should photo eyes be replaced? A: Quality photo eyes last 10 to 15 years. If they fail before that, corrosion or physical damage is usually the cause. Test yours monthly to catch problems early.

Q: What if one photo eye is blocked but the other works? A: The system requires both sensors working together. If one is blocked or failed, the door won't reverse safely. Clean and test both before assuming only one needs repair.

Q: Do all garage doors have photo eyes? A: Federal law requires photo eyes on all residential garage door openers installed after 1993. If your door is older and lacks them, adding a retrofit kit is inexpensive and essential for safety.

Q: Can weather damage photo eyes permanently? A: Yes. Salt air and moisture corrode wiring and sensor housings over time. Our coastal South San Francisco climate accelerates this wear. Regular maintenance extends their life significantly.

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