St. Peters Garage Door Repair
Garage Door Sensors & Keypads — What You Need to Know
A complete guide by St. Peters Garage Door Repair — covering how safety sensors work, what a blinking light means, and how to add keypad and smart home access to your garage.
What Do Garage Door Safety Sensors Do?
The two small sensors mounted near the floor on each side of your garage door create an invisible infrared beam across the opening. Federal law requires every garage door opener manufactured after 1993 to include this safety feature: if anything breaks the beam while the door is closing, the opener must immediately reverse. This protects children, pets, and objects from being struck by a closing door.
Never bypass or disable your safety sensors. A blinking sensor light is your opener's way of telling you something is wrong. Ignoring it — or taping over the sensor — removes a critical safety feature and creates a serious injury risk.
What Does a Blinking Sensor Light Mean?
Different opener brands use different blink patterns to indicate different faults, but the most common causes of a blinking sensor light are:
Sensor Misalignment
The most common cause. If the sensors are not perfectly aimed at each other, the beam is broken and the opener will not close the door. A slight bump to the sensor bracket is all it takes.
Dirty Sensor Lens
Dust, spider webs, or moisture on the sensor lens can block the beam. A simple cleaning often resolves the issue without any parts replacement.
Wiring Fault
The low-voltage wires running from the opener to each sensor can be damaged by pests, staples, or pinching. A broken wire will cause a constant fault signal.
Failed Sensor Unit
Sensors can fail due to age, moisture intrusion, or physical damage. When cleaning and realignment do not resolve the issue, the sensor unit itself needs replacement.
Wireless Keypads & Smart Home Integration
A wireless keypad lets you enter your garage without carrying a remote — ideal for families with children, regular service visitors, or anyone who exercises outdoors. Modern keypads use rolling-code encryption, generating a new security code with every use to prevent code-grabbing attacks. For homeowners with smart home systems, we can integrate your opener with MyQ, Google Home, and Amazon Alexa so you can control and monitor your garage from your phone.
Rolling-Code Keypads
Every keypress generates a unique encrypted code. Even if someone captures the signal, they cannot replay it to open your door.
MyQ Smart Integration
LiftMaster and Chamberlain openers with myQ let you open, close, and monitor your garage from anywhere using your smartphone.
Google Home & Alexa
Compatible openers can be controlled by voice command through Google Assistant or Amazon Alexa for hands-free convenience.
Multi-Code Keypads
Set different PIN codes for different family members or service providers. Temporary codes can be created for housekeepers, contractors, or guests.
Local to St. Peters — All Brands, Same-Day Service
We diagnose and repair sensor issues on all opener brands, and we install and program keypads and smart home integrations on the same visit. Based right here in St. Peters, Missouri, we are always close by for follow-up support.
Safety sensor alignment & replacement
Wireless keypad installation & programming
Rolling-code security keypads
Smart home integration (MyQ, Google, Alexa)
Photo-eye sensor testing & calibration
Licensed contractor LC014440397
Frequently Asked Questions
Common questions from St. Peters homeowners — answered honestly.
Sensor Blinking? Keypad Not Working? Call Us.
Same-day service available. Free on-site estimate. No surprises.