Well, I'm sorry, but, SOMETHING the plumber did, caused the problem.
"and he caught a alarm cable which set off the alarm" .... "since then when i set the alarm all six zones light up on keypad with a constant beeping but i have no lights on the sensors"
All the sensor lights not working from that time on = a BLOWN fuse.
Perhaps he has pinched a cable with a floor board, hit it with a hammer, nicked it with a Stanley knife(very difficult to trace) or something along those lines.
Hope he has Insurance because the repair bill is his.
acorn
May 2011