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.

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.

will they work for a craftsman opener ?

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

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

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Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1

Chamberlain 820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1

Product ID: 372019211

Details

Brand
CHAMBERLAIN
Item dimensions L x W x H
3.13 x 4.5 x
Material
Plastic
Mounting Type
Bracket
Style
Sensors

📏18-inch extension wire for flexible installation

🔄Automatic door reversal on obstruction

🛠️Compatible with Chamberlain, LiftMaster & Craftsman

$U3922

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Description

🚪🔒 Elevate your garage safety game with invisible tech that has your back!

DUAL SENSOR PACK - Includes 2 sensors plus mounting brackets and extension wire for complete setup
LOW PROFILE DESIGN - Sleek sensors minimize misalignment risk and maintain garage aesthetics
TRUSTED COMPATIBILITY - Works flawlessly with top brands ensuring peace of mind and easy replacement
SEAMLESS SAFETY INTEGRATION - Fits all Chamberlain openers post-1997 for effortless upgrade
INVISIBLE PROTECTION BARRIER - Projects a precise light beam to prevent accidents before they happen

The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers advanced, low-profile sensors that automatically reverse your garage door upon detecting obstructions. Compatible with Chamberlain openers made after 1997, as well as LiftMaster and most Craftsman models, this kit includes two sensors, mounting brackets, and an 18-inch extension wire for flexible installation. Rated 4.6 stars by 800 users, it ensures reliable, accident-preventing performance backed by a 1-year warranty.

Specifications

ASIN	B09GB6JHRR
Best Sellers Rank	#40,030 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in Garage Door Sensors
Brand Name	CHAMBERLAIN
Customer Reviews	4.6 4.6 out of 5 stars (800)
Global Trade Identification Number	00012381197460
Included Components	2-sensors, mounting brackets, 18 in. of extension wire, instruction manual
Item Dimensions	3.13 x 4.5 x 6.5 inches
Item Type Name	Garage Door Safety Sensors
Manufacturer	CHAMBERLAIN CORP
Material Type	Plastic
Model	820CB
Mounting Type	Bracket
Part Number	820CB
Specific Uses For Product	garage door safety detection
Style Name	Sensors
UPC	012381197460
Unit Count	1.0 Count
Warranty Description	1-year warranty

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TrustScore 4.5 | 7,300+ reviews

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$U3922

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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

3 weeks ago

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The product exactly matches the description. Very satisfied with my purchase.

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