On Aug 24, 11:32*am, Eric in North TX wrote:
On Aug 24, 9:34*am, Andy wrote:

The garage door at my mother's house has an intermittent problem.

Sometimes it won't close. If I hold the button down, the door will go
down but when I let go of the bottom it starts going back up.

There isn't anything blocking the sensor.

The garage door opener is a Genie screw drive type that is about 15
years old.

What can I look for to diagnose the problem.

Thanks.

That certainty sounds like a sensor problem. Clean the lenses, check
the alignment, check the wires. There are usually LED lights on them
to show they are aligned and working.

Thanks

I will try to see if I can find a repair manual for it.

Andy