Hi, we have just moved into a rental property with a Gardtec 300 alarm system. I asked the agent about the alarm and he said it wasn’t a working alarm and knew nothing about it. There was no power coming to the alarm, so I checked the fuse box, nothing was there, so I inserted a fuse. Power light and LED day light is on but nothing happening. I have tried entering the master code but not doing anything. Can anyone suggest what I need to do to get alarm working.