I've just installed a Texecom Veritas Excel, 8 zones (zone 1 uses magnetic door contacts for front and back door, rest are PIR's), 2 remote keypads, external bell box and one dummy box. It is my first ever attempt, but we need to keep costs down so I decided to give it a try as I am competent at basic electrical work and I can follow instructions. I powered up and during the walk through test Zones 1 and 2 of the PIR zones are constantly 'open', but the rest operate as they should. I'm struggling to understand why! I've checked the wiring at the sensors and the control panel and it all seems to be fine. I've swapped the PIR's around but the fault stays with the Zone. I've also swapped the zone at the control panel around and the fault follows the red & black wires. The LED on the PIR's indicate that movement is sensed, but regardless of the LED being lit, a voltage can be measured across the red and black wires at the control panel. All the rest of the equipment seems to be functioning properly, just these 3 zones are not. Anyone any suggestions?