Hello,

For years I’ve had no issues with my ground contact sensors in my garage. Last week I noticed I couldn’t arm my house as zone 7, which are my garage doors showed a fault. I have one wire coming off my panel to connect both sensors so if either garage door opens it trips. I have an image of the wiring diagram which is pretty basic, but I hope makes sense

https://imgur.com/W9koINJ

I tried a multimeter and put it into resistance mode and can trip the sensor to closed, but it only shows closed for a split second and then goes back to open. Does anyone have any suggestions as to how i can troubleshoot or solve this issue?