The first time it happened was with a Honeywell 5800PIR-RES, control screen showed motion (open). I went in the room to check it, room was empty and everything looked normal. Waiting about 10 minutes it still showed open. I mistakenly thought arming it would reset the sensor, well the alarm went off instantly at end of countdown. Very fast response! After that the sensor showed closed.
Fast forward to today, now a different Honeywell 5800PIR-RES shows open and won’t go closed. Again nothing in the room.
So my question is there a reason this could be happening? Should I replace the 2 sensors?
What is the easiest way to reset the sensor if it’s stuck open?