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 Garage Door Safety Sensor Replacement, 2-Pack

Chamberlain 820CB Garage Door Safety Sensor Replacement, 2-Pack

Product ID: 372019211

Details

Brand
CHAMBERLAIN
Item dimensions L x W x H
3.13 x 4.5 x
Material
Plastic
Style
Sensors
UPC
012381197460

⚡Instant auto-reverse safety response

🔒Universal compatibility since 1997

🛠️Complete 2-pack with mounting & wiring

¥12513

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Description

🚪 Safety that’s always in sight, so you never miss a beat.

ALL INCLUSIVE KIT - Includes 2 sensors, mounting brackets, 18-inch extension wire, and easy-to-follow instructions for hassle-free installation.
NEXT LEVEL SAFETY - Automatically reverses your garage door at the first sign of obstruction—protecting your family and belongings.
LOW PROFILE DESIGN - Sleek sensors minimize risk of misalignment or damage, ensuring consistent performance.
TRUSTED RELIABILITY - Backed by a 1-year warranty and a 4.6-star rating from over 800 users—join the safety-conscious pros upgrading now.
SEAMLESS COMPATIBILITY - Works flawlessly with all Chamberlain, LiftMaster, and most Craftsman openers made after 1997.

The Chamberlain 820CB Garage Door Safety Sensor Replacement 2-Pack offers universal compatibility with all Chamberlain garage door openers manufactured after 1997. Featuring an intuitive auto-reverse function that activates upon obstruction detection, these low-profile sensors reduce misalignment risks. The kit includes two sensors, mounting brackets, an 18-inch extension wire, and a manual, ensuring easy installation and reliable protection backed by a 1-year warranty.

Specifications

ASIN	B09GB6JHRR
Best Sellers Rank	#37,726 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 (816)
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 Highlight	Works with all garage openers made after 1997, Includes brackets and 18 in wire, Auto-reverses on obstruction
Item Type Name	Garage Door Safety Sensors
Manufacturer	CHAMBERLAIN CORP
Material Type	Plastic
Model	820CB
Number of Items	1
Part Number	820CB
Style Name	Sensors
UPC	012381197460
Unit Count	1 Count
Warranty Description	1-year warranty

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¥12513

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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