"Tony Hwang" wrote in message
...
Must we have a secret code to know what an SD 9500 is? I'm going to
guess it may be a garage door? If so, check the safety reflectors to
see if they are properly aligned.
I get that sometimes in the late afternoon when the setting suns shines
directly into the safety reflector.

Then you should witch around safety T beam in position. Let the
transmitter face the sun.

Where I worked we had an elevator with doors on the outside. The sun would
cause that problem a times. Could not switch the sensors. Stupid door
thought someone was in the door and they would start to close, then open
back up. Someone would have to stand outside and block the sun so the
elevator could be used.