TheAlarmTech.com

So,
you have 42 devices in comm fault on this SLC line?
if this is true do the devices swing in and out of fault?
when you pull a map what do you see?
the green led flashes but the device is in comm fault?
and it is getting worse over time.

check the map and let us know what you see.
which version of SDU are you using, 5.20 makes it easier to read the map

HI ALL,
AFTER INSTALLATION, DURING MAPPING, WE GOT EVERY THING OK. ALL DETECTORS WORKING PROPERLY. AFTER THREE MONTHS AND GRADUALLY, FEW DETECTORS SHOWING COMM FAULT IN PANEL. ON TESTING, WE GETTING 18-22v ACROSS THE TERMINAL OF DETECTORS. ON INSTALLING THE GREEN LED LIGHT GLOWS FOR FEW SEC THEN NO LED GLOW. PREVIOUSLY, 10 NO.S SHOWING FAULTY, NOW ITS 42 NO.S WITHIN A YEAR. CAN ANYONE SUGGEST?