CHAMBERLAIN820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1

CHAMBERLAIN820CB Replacement Garage Door Safety Sensor, 2-Pk. - Quantity 1

Q: 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.

Q: 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.

Q: will they work for a craftsman opener ?

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

Q: 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

4.6/5

Product ID: 389594817

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Details

Material
Metal
Brand
CHAMBERLAIN
Colour
Black
Exterior finish
Black
Installation type
Screw-In

📏Low-profile design for precise alignment

🔧Universal compatibility since 1997

⚠️Instant automatic door reversal on obstruction

Frequently Bought Together

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

100 Feet Universal Garage Door Wire 2 Conductor Bell Wire Fits for Control Station/Sensors,24/2 AWG

41A5034 Safety Sensor Kit, Replacement for Craftsman/Chamberlain/Liftmaster Garage Door Sensor, Compatible with Liftmaster/Chamberlain/Craftsman Garage Door openers Made After 1997

Description

🚪 Safety that’s always watching—upgrade your garage’s smart shield!

TRUSTED CERTIFIED - UL-certified for peace of mind and reliable performance every time.
SAFETY FIRST ALWAYS - Automatically reverses your garage door at the first sign of obstruction—protecting your family and belongings.
SEAMLESS COMPATIBILITY - Works flawlessly with Chamberlain, LiftMaster & most Craftsman openers—no guesswork needed.
SLEEK LOW PROFILE DESIGN - Discreet sensors minimize accidental misalignment, keeping your system running smoothly.
COMPLETE INSTALLATION KIT - Includes 2 sensors, mounting brackets, and 18 inches of extension wire for hassle-free setup.

The Chamberlain 820CB Replacement Garage Door Safety Sensor 2-Pack offers universal compatibility with garage door openers made after 1997, featuring a low-profile design that reduces misalignment risk. Equipped with automatic door reversal upon obstruction, these UL-certified sensors come with mounting brackets and extension wire for easy installation, ensuring enhanced safety and seamless operation.

Specifications

Recommended uses for product	Preventing accidents and reversing garage doors upon obstruction
Specification met	UL
UPC	012381197460
Number of pieces	2
Manufacturer	CHAMBERLAIN CORP
Part Number	820CB
Product Dimensions	5.28 x 2.9 x 3.15 cm; 290 g
Item model number	820CB
Size	S
Style	Sensors
Item Package Quantity	1
Included Components	2-sensors, mounting brackets, 18 in. of extension wire, instruction manual
Batteries included?	No
Batteries Required?	No
Item Weight	290 g

Have a Question? See What Others Asked

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

do these sensors come with wires attached to them ?

will they work for a craftsman opener ?

Could I use this sensor to light up a light when the sensor is activated?

Common Questions

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