If the range improves then the interference is coming from a device in the garage.
Garage door opener seems weak.
I just read something on another forum about people having trouble with their garage door openers not working.
The garage door opener may signal an error code by flashing lights on the motor unit in a repeating pattern when the opener doesn t work.
It was tracked down to led bulbs causing rfi radio frequency interference and blocking the weak signal from the opener and or homelink.
Sooo if you are having difficulties check the bulb in the overhead motor compartment and if it s led replace it with an incandescent bulb.
If you see an error code flashing on the motor unit look up the error code in your owner s manual or refer to our error code charts to decipher the code and troubleshoot the problem.
It s important to get this switch at just the right distance from the motor so that the door is able to close all the way but the motor also knows to stop running.
These motors have a run capacitor that can get weak or go bad reducing the motor s start and run torque below acceptable levels.
Many garage door openers use fractional horsepower psc motors.
From informational videos to product manuals and troubleshooting articles the chamberlain group resource library has the information you need.
To isolate potential sources of interference turn the circuit breaker off to the garage and plug the garage door opener into an extension cord from another room.
Close the garage door.
Try making small adjustments.
Wipe away grease and grime buildup on all hinges rollers and roller pins with a damp cloth.
This is a very common failure with single phase hvac equipment too.
Find the chamberlain garage door opener technical support you need to get your garage door opener operational.