Just installed a new genie garage door opener. Adjusted both the open and closed magnetic limit switches. Open works fine. Close switch does not stop the door. What could it be switch or circuit board?

Question edited for clarity and correct spelling of maker.
Question moved form Office Equipment Category.

Limit switches if the lenses are clean an nothing within 6" of them.

The Garage Door Comes Down, Hits the Floor and Reverses

Chamberlain Group https://support.chamberlaingroup.com > article > GDO...
The most common reason the door reverses after it touches the floor is the down or close travel needs to be adjusted.

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How to Reset Garage Door Opener Limit Switches

myohd.com https://www.myohd.com > blog > reset-garage-door-o...
Jan 5, 2018 - Open and close the garage door. If the problem remains, continue adjusting the up limit switch until the door operates normally. Garage Door ...

Chamberlain Garage Door Opener Troubleshooting

Fix It Right Garage Doors https://fixitrightgaragedoors.ca > chamberlain-garage-...
Chamberlain garage door will not close all the way. Door will move partially (about 1 foot) then stop and only respond to constant pressure commands. RPM ... ..

There are upper and lower limit settings, it sounds like you have the lower limit set to low. Adjust it so it stops the door as it contacts the floor and see if this solves the problem. It is possible these limit controls are damaged and will not stay set. If that is the case it may be best to replace the opener if you cannot find a replacement.

It is probably the lubrication in the rollers. You should lubricate them and make a small adjustment to the torque sensor. When it gets cold the lub gets stiff. The torque sensor will detect this and open the door, a safe position.

This is the close limit sensor so yes it should work. They have them for $2.40 right now from an Amazon vendor - http://www.amazon.com/Genie-Excelerator-Close-Switch-33950S/dp/B00283OBXY/ref=?ie=UTF8&m=A1CTO3U79X1RZ3

You can also buy replacement sensors as a 10 pack in case you end up needing more from here -
http://dpcdist.com/flangemountcontactandmagnetendleads.aspx

UNPLUG RHE UNIT WAIT ABOUT 5 MIN. AND PLUG IT BACK IN.

THIS RESETS THE SEQUENCER.

SOMETIMES IT WILL SOLVE THE PROBLEM.

HOPE THIS HELPS

The Coromaster 2000 does not operate off limit switches. It has a quarter-revolution optical pulse counter. To re-program the open and close limits do the following: Ensure that the door is open at least a couple of feet. Press the reset button once or twice Short out pushbutton and common and hold until close limit and then release. Door should stop at your new close limit. Wait 5 seconds. Short out pushbutton and common and door will open. Hold the short until open limit and then release. Limits should now be set.

Sounds like a skinned wire on your front or rear limit switches is touching metal. Go over your low voltage wiring and test again.

I have similar jerkiness problem and have gone through all the nine yards of possible causes. The motor stops at random position and at random time. Even when I unhook the door from the carriage, it still showed this symptom. It started when I had one torsion spring broken. I replaced both torsion springs and adjusted for weight balance. Make sure the two cables windup properly along the thread of the pulley; Checked the photo eye sensors; checked/test capacitor; cleaned rpm sensor; adjusted all possible force settings; make sure limit switch at sound; re-programmed my remote just to check if the logic board somehow still work on this side and it did;
One important observation I have is that when I adjusted the carriage chain, I've noticed that the opener unit turns off and on as if there's a loose connection/contact. This I pursued more. The more I investigate, I spotted a "tiny" spark on one logic board soldering at the transformer footing as I **** the back panel (where the board is mounted) back and forth to simulate the on/off due to the loose contact observed earlier. This one solves everything! All I had to do is take the logic board out and re-solder that failed connection and Hooray - it fixed the problem!
Hope this helps someone with similar issues,

Viewful
Canton, Mi

The close setting limit switch needs adjusted. Once it is adjusted it should work just fine.

door will not close all the way. will go partway down then reverse itself.