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: 389594817

Details

Brand
Chamberlain
Item dimensions L x W x H
8 x 11.4 x
Material
Plastic
Mounting type
Bracket
Style
Sensors

💡Bright LED indicators for easy alignment

📏Fits all Chamberlain openers post-1997

🔧Includes mounting brackets & extension wire

Description

🚪🔒 Elevate your garage safety game with sensors that never miss a beat!

LOW PROFILE DESIGN - Sleek sensors minimize misalignment risks and blend discreetly into your garage setup.
TRUSTED DURABILITY - Backed by 4.6-star reviews and engineered for long-lasting, reliable performance.
UNIVERSAL COMPATIBILITY - Seamlessly works with Chamberlain, LiftMaster & Craftsman openers for hassle-free upgrades.
COMPLETE INSTALLATION KIT - Comes with sensors, brackets, 18-inch extension wire, and clear instructions—DIY made effortless.
PRECISION SAFETY REVERSAL - Automatically reverses your garage door at the slightest obstruction—because safety can’t wait.

The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers universal compatibility with all Chamberlain garage door openers made after 1997, plus LiftMaster and most Craftsman models. Featuring bright LED indicators and a low-profile design, these sensors ensure precise alignment and automatic door reversal upon obstruction. The package includes mounting brackets, 18 inches of extension wire, and an instruction manual for easy installation, delivering trusted, durable safety backed by excellent customer reviews.

Specifications

ASIN	B09GB6JHRR
Brand	Chamberlain
Customer Reviews	4.6 4.6 out of 5 stars (776)
Global Trade Identification Number	00012381197460
Included Components	2-sensors, mounting brackets, 18 in. of extension wire, instruction manual
Item Dimensions	8 x 11.4 x 16.5 centimetres
Item Type Name	Garage Door Safety Sensors
Manufacturer	CHAMBERLAIN CORP
Manufacturer Part Number	820CB
Material	Plastic
Model Number	820CB
Mounting Type	Bracket
Number of Items	1
Specific Uses For Product	garage door safety detection
Style Name	Sensors
UPC	012381197460
Unit Count	1.0 count

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