The method to reengage the carriage depends on the model of garage door opener you own.
Genie garage door limit switch troubleshooting.
Your garage door may be disconnected from the opener.
Using the push button or transmitter position the garage door approximately 1 to 2 feet from the closed position.
To try and correct the problem make sure the eyes on the sensors are clean the wire connections are securely fastened at the sensors and motor head and the eyes are directed at each other.
Also try unplugging the garage door opener and re plugging the unit back into the outlet.
Remove any old limit clips which may still be attached to the chain.
Setting the down limit to purchase these limits click onto genie limits 24701r step 1.
How to replace and possibly repair the limit switch or travel limit switch on a genie garage door opener.
Check that the emergency release cord has not been pulled.
Turn off the sure lock aka vacation mode on the wall console check if limits are properly set check the door balance condition and door spring check opening force control or force settings.
Found on genie screw drive openers and overhead gar.