Blinking Sensor Lights
Usually caused by misalignment, dirty lenses, loose brackets, or wiring issues.
Sensor Testing & Alignment
Garage Door Safety Sensor Service
Valiant Garage Door handles garage door safety sensor problems that cause doors to reverse, refuse to close, blink at the opener head, or fail the auto-reverse safety test.
Common Safety Sensor Problems
Door Will Not Close
When the beam is interrupted or the sensor circuit is failing, the opener may stop or reverse immediately.
Intermittent Closing
Sunlight, vibration, damaged wires, or loose fasteners can create random failures that need a real inspection.
What We Check
- Sensor alignment and mounting brackets
- Lens cleaning and obstruction checks
- Wire condition at the opener head and jamb
- Auto-reverse function and full closing cycle
- Related opener logic if the issue is not sensor-only
Upgrade to Full-Opening Sensor Coverage
Valiant Garage Door is an Infinity Shield dealer. The system replaces one low sensor beam with a 25-beam infrared array designed to detect open hatches and other obstructions higher in the garage-door opening.
Related Pages
Garage Door Safety Sensor: How To Fix It Video Guide
Sensor Diagnosis or a Different Closing Problem?
A door that reverses may need sensor service, opener diagnostics or correction of mechanical resistance. Compare these service paths before assuming replacement sensors are the answer.
Services Overview
Start here for every garage door repair, spring, opener, maintenance, and service-area path.
Emergency Garage Door Repair
Primary urgent repair hub for stuck doors, broken springs, snapped cables, and unsafe doors.
Spring Replacement Cost & Time
Broken spring pricing, 30 minute to 1 hour timing, warranty, and safety answers.
Opener Repair Diagnostics
LiftMaster diagnostics, sensors, travel limits, force settings, remotes, keypads, and repair-vs-replace guidance.
Opener Installation Pricing
Compare LiftMaster models plus $229 standard overhead and $249 wall-mount installation starting labor.
Maintenance & Safety Tune-Ups
Tracks sticking, rollers, lubrication, door balance, tune-up frequency, and safety inspection answers.
Custom & New Garage Doors
Moenave custom/new door planning, quote factors, replacement context, and design support.
Service Areas
Connected city pages for Pleasanton, Dublin, Livermore, Fremont, San Ramon, Danville, Sunol, and nearby East Bay routes.
Book This Service
Get a Reversing Door's Safety System Checked
Describe the sensor lights, when reversal occurs and whether the door has visible mechanical damage. Do not bypass the photo eyes or increase force to make the door close.
Verified Garage Door Repair Results
These matched CompanyCam comparisons document component conditions before service and the verified result after Valiant Garage Door completed the related work. The technician captions are used as factual reference, and every pair comes from the same project.
Pleasanton Garage Door Safety Sensor Replacement
An older safety sensor location was replaced with a newly positioned garage door sensor in Pleasanton.
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San Mateo Garage Door Safety Sensor Replacement
An older garage door safety sensor was replaced with a new sensor at this San Mateo property.
View documented project →Proof Before Proposal — Documented findings, clear recommendations, and completed-work evidence. Credentials & Housecall Pro recognition · Industry appearance
Documented garage door work
These field videos show the components, inspections and service work behind our recommendations.