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

💡Bright LED indicators for easy troubleshooting

📏Low-profile design for perfect alignment

🔧Universal compatibility since 1997

MX$2209

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Description

🚪 Upgrade your garage’s safety IQ with effortless precision!

SEAMLESS COMPATIBILITY - Works flawlessly with Chamberlain, LiftMaster & Craftsman openers since 1997
COST SAVING RELIABILITY - Replace sensors yourself and avoid costly service calls—proven to last over a decade
INVISIBLE SAFETY SHIELD - Projects an invisible beam that instantly reverses your door on obstruction
SLEEK LOW PROFILE DESIGN - Minimizes risk of misalignment or damage, keeping your system flawless
EFFORTLESS DIY INSTALLATION - Includes all mounting brackets, extension wire & connectors for a quick setup

The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack ensures your garage door automatically reverses when obstructed, enhancing safety. Compatible with all Chamberlain openers made after 1997 and many LiftMaster and Craftsman models, these low-profile sensors feature bright LED indicators for easy troubleshooting. The package includes sensors, mounting brackets, 18 inches of extension wire, and connectors, enabling a straightforward DIY installation that saves you hundreds on professional repairs.

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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MX$2209

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered 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 Mexico.

Secure transaction

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