Magnetic Door Contact
If you have problems with a magnetic door contact from your alarm system than the possible reason is a faulty reed switch:
![Door Contact Image 3](https://reachcoding.eu/assets/thumb/doorcontact3.png)
You can test the reed switch with your multimeter (with and without the magnet):
![Door Contact Image 2](https://reachcoding.eu/assets/thumb/doorcontact2.png)
To be sure you can bridge over the reed switch with a short wire:
![Door Contact Image 1](https://reachcoding.eu/assets/thumb/doorcontact1.png)