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CHAMBERLAIN820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1

CHAMBERLAIN820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1

Q: remote open the door but wont close it keep coming back up, but i can close it from the inside ,do you think this will solve the problem ?liftmast

If you're able to close the door by holding down the button on the wall , then yes. However, it could be bad wiring ... maybe a bad connection. I see lots of time people use electrical tape and the adhesive actually breaks the connection over time. Try resplicing the connections if they are spliced first. If there is no splice, then it's possible the eyes are bad. To test them... use a newer 9volt battery. Detach both of the sensors and connect the matching wires together. Connect the wire with the black line to the positive side and the white to the negative. Line them so they are facing each other. If both lights come on then it's not the eyes. Could be a bad wire that is pinched or a bad circuit board on the motor unit. Good luck.

Q: do these sensors come with wires attached to them ?

3 foot pigtails. You'll need to have wire from your opener to these and then splice them.

Q: will they work for a craftsman opener ?

Yes, I used my with a Craftsman and it worked perfect.

Q: Could I use this sensor to light up a light when the sensor is activated?

No. it has a circuit board in the door opening. It is not working like a switch but if the light is already on the garage door opener then that light will come on

4.6/5

Product ID: 372019211

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Details

Material
Metal
Brand
CHAMBERLAIN
Color
Black
Exterior Finish
Black
Installation Type
Screw-In

📏Compact 2.08x1.14x1.24 in

🔄Auto-Reverse on Obstruction

🔒UL Certified Safety

Description

🚪 Safety that’s always on guard — because your peace of mind can’t wait!

LOW PROFILE DESIGN - Sleek sensors minimize risk of misalignment, ensuring consistent, reliable operation.
TRUSTED DURABILITY - Backed by a 1-year warranty and UL certification, engineered for long-lasting garage door safety.
SEAMLESS COMPATIBILITY - Works flawlessly with Chamberlain, LiftMaster & most Craftsman openers for universal peace of mind.
INVISIBLE SAFETY SHIELD - Projects an invisible light beam to detect obstructions and prevent accidents before they happen.
COMPLETE INSTALLATION KIT - Includes 2 sensors, mounting brackets, 18-inch extension wire, and easy-to-follow manual for hassle-free setup.

The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers UL-certified, low-profile sensors that automatically reverse your garage door upon obstruction. Compatible with all Chamberlain openers post-1997, as well as LiftMaster and most Craftsman models, this kit includes everything needed for quick installation and reliable, accident-preventing performance.

Specifications

Recommended Uses For Product	Preventing accidents and reversing garage doors upon obstruction
Specification Met	UL
UPC	012381197460
Number of Pieces	2
Manufacturer	CHAMBERLAIN CORP
Part Number	820CB
Item Weight	10.2 ounces
Product Dimensions	2.08 x 1.14 x 1.24 inches
Item model number	820CB
Is Discontinued By Manufacturer	No
Size	Small
Style	Sensors
Item Package Quantity	1
Included Components	2-sensors, mounting brackets, 18 in. of extension wire, instruction manual
Batteries Included?	No
Batteries Required?	No
Warranty Description	1-year warranty

Have a Question? See What Others Asked

remote open the door but wont close it keep coming back up, but i can close it from the inside ,do you think this will solve the problem ?liftmast

do these sensors come with wires attached to them ?

will they work for a craftsman opener ?

Could I use this sensor to light up a light when the sensor is activated?

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TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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E£ 7732

Duties & taxes incl.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Zainab N.

Fantastic and great service. Shipping was faster than expected.

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