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

⚡Instant auto-reverse on obstruction

🔒Universal Chamberlain compatibility

🛠️Complete DIY install kit

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Bs.869

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Details

Brand
CHAMBERLAIN
Color
Black
Exterior Finish
Black

Description

🚪 Upgrade your garage safety with zero hassle and total confidence!

DIY FRIENDLY KIT - Includes sensors, brackets, extension wire & connectors for quick, hassle-free install
SAFETY FIRST ALWAYS - Automatically reverses garage door on any obstruction to prevent accidents
LONG TERM RELIABILITY - Durable build backed by UL certification and 1-year warranty for peace of mind
SUNLIGHT PROOF DESIGN - Low-profile sensors reduce misalignment and resist sunlight interference
SEAMLESS COMPATIBILITY - Works flawlessly with Chamberlain, LiftMaster & Craftsman openers since 1997

The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers universal compatibility with all Chamberlain garage door openers made after 1997. Designed with low-profile, sunlight-resistant sensors, it ensures automatic door reversal upon obstruction, enhancing safety. The kit includes everything needed for a straightforward DIY installation, saving time and costly service calls. Certified for quality and backed by a 1-year warranty, it’s the smart upgrade for reliable, accident-free garage door operation.

Specifications

ASIN	B09GB6JHRR
Best Sellers Rank	#36,596 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #11 in Garage Door Sensors
Brand	CHAMBERLAIN
Brand Name	CHAMBERLAIN
Customer Reviews	4.6 out of 5 stars 785 Reviews
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
Item dimensions L x W x H	3.13 x 4.5 x 6.5 inches
Manufacturer	CHAMBERLAIN CORP
Material	Metal
Material Type	Metal
Model	820CB
Mounting Type	Bracket
Part Number	820CB
Style	Sensors
Style Name	Sensors
UPC	012381197460
Unit Count	1.0 Count
Warranty Description	1-year warranty

Reviews

M**N

4.08.2023

J**W

2.12.2025

L**Y

31.03.2026

J**B

10.04.2026

C**.

17.12.2022

B**E

17.07.2025

P**P

21.01.2026

J**E

18.10.2024

J**E

7.03.2022

S**4

4.04.2022

A**R

9.03.2022

S**Z

6.11.2021

G**O

6.04.2024

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