Your interactive guide to diagnosing and fixing common sensor problems safely and effectively.

Start Here: The Quick Fix

Most garage door sensor issues are caused by simple problems. Before diving deep, check for obstructions in the sensor path, wipe the sensor lenses clean with a soft cloth, and ensure both sensors have solid, not blinking, indicator lights. This resolves over 80% of problems.

Interactive Troubleshooting Guide

Click a step to see detailed instructions. Start with Step 1 and proceed in order.

1. Check Power & Indicator Lights

2. Clear Obstructions

3. Clean the Sensor Lenses

4. Align The Sensors

5. Inspect The Wiring

Step 1: Check Power & Lights

The small LED lights on the sensors are your best diagnostic tool. Both sensors must be powered on to work.

• Sending Sensor (Amber Light): Should have a solid amber light, indicating it’s powered on.
• Receiving Sensor (Green Light): Should have a solid green light, indicating it sees the sending sensor.
• Blinking/No Light: A blinking or unlit sensor indicates a problem with alignment or wiring.

Step 2: Clear Obstructions

The most common cause of failure. The sensors create an invisible beam near the floor. Anything blocking this beam will prevent the door from closing.

• Remove boxes, tools, trash cans, and any other items from the path between the sensors.
• Check for less obvious things like spiderwebs or debris directly on the sensor path.
• Ensure the path is completely clear before re-testing the door.

Step 3: Clean the Sensor Lenses

Dirt, dust, and grime on the sensor “eyes” can block the beam just like a solid object.

• Use a soft, clean microfiber cloth to gently wipe both sensor lenses.
• Avoid using harsh chemicals or abrasive materials that could scratch the plastic.
• A little moisture on the cloth is okay, but don’t spray liquid directly onto the sensor.

Step 4: Align The Sensors

If the receiving (green) sensor light is blinking, the sensors are likely misaligned. They must be pointed directly at each other.

• Gently adjust one sensor by hand until its LED light turns solid. Most sensor brackets have a wing nut for easy adjustment.
• You can use a string or laser level to ensure they are at the same height and pointing at each other perfectly.
• Once the green light is solid, tighten the bracket’s wing nut to lock it in place.

Step 5: Inspect The Wiring

Damaged or loose wires can cut power to the sensors. CAUTION: Disconnect power to the garage door opener before inspecting wires.

• Check the wires connected to the back of each sensor for loose connections.
• Trace the wire from the sensors back to the motor unit. Look for any breaks, staples, or damage.
• Check the connections at the motor unit terminal. Gently tug each wire to ensure it’s secure.

Analysis of Common Sensor Problems

This chart shows the most frequent causes of sensor failure based on service data.

Final Safety & Tools Checklist

✔Power to the garage door opener is disconnected (for wiring checks).

✔Have a soft microfiber cloth for cleaning.

✔Have a stable step ladder if needed.

✔Keep hands and tools clear of the door track.

✔After fixing, test by placing an object (like a paper towel roll) under the door as it closes. It should reverse.

Frequently Asked Questions

When should I call a professional?

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If you’ve followed all the steps, including checking the wiring, and the sensors still don’t work, it’s time to call a pro. The sensors themselves might be faulty or there could be an issue with the opener’s logic board.

Can I just bypass the sensors?

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No. Bypassing safety sensors is extremely dangerous and violates federal law in the U.S. They are a critical safety feature to prevent injury or property damage. Never disable them.

This guide is for informational purposes. Always prioritize safety. Consult a professional if you are unsure about any step.