LiftMaster Garage Door Error Code 17: How to Fix It
Easy 15-30 minutes Medium Severity
Verified June 2026
- Error Code
- 17
- Brand
- LiftMaster
- Product Type
- garage_door
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 15-30 minutes
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Tools You'll Need
- Soft cloth
- Stepladder
- Screwdriver (if needed)
How to Fix Error Code 17
-
Safety First: Unplug the Opener
Always unplug the opener before performing any maintenance. -
Inspect the Safety Reversing Sensors
-
Check Sensor Alignment
-
Inspect Sensor Wiring
Be careful not to damage the wires further. -
Check the Door Control Panel
-
Test the Door Operation
Parts You May Need
Safety reversing sensor kit
Check Price on Amazon
Safety reversing sensor kit
Check Price on Amazon
Safety reversing sensor kit
Check Price on Amazon
Safety reversing sensor kit
Check Price on Amazon
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When to Call a Professional
If you have completed all steps and error code 17 persists, the logic board or a sensor may need replacement. Contact a professional garage door technician, as these repairs involve handling high-voltage components and precise adjustments.Frequently Asked Questions
What does error code 17 mean on a LiftMaster garage door opener?
Error code 17 indicates a motion detector fault. It usually means the safety reversing sensors are obstructed, misaligned, or have a wiring issue.
Can I bypass the safety sensors on my LiftMaster opener?
No, bypassing the safety sensors is dangerous and illegal in many areas. They are required by law to prevent the door from closing on people or objects.
Why does my LiftMaster show error 17 after cleaning the sensors?
If the error persists after cleaning, the sensors may be misaligned. Ensure the LED on each sensor is solid, not blinking. Also check the wiring for damage.
How do I reset my LiftMaster garage door opener after error 17?
To reset, unplug the opener for 30 seconds, then plug it back in. If the error returns, press and hold the 'Learn' button on the opener for 6 seconds until the LED turns off. Then reprogram your remotes.
Do I need to replace the sensors to fix error 17?
Often, cleaning and realigning the sensors resolves the issue. Only replace the sensors if they are physically damaged or the wiring is broken and cannot be repaired. Replacement sensors are available at hardware stores.