our keypad is displaying NOT READY,the panel has the TRBL light on thankyou.

timbo, May 2012

You've already had the answer to this.

acorn, May 2012

How long as it been alerting you ?,my guess is for a while now.
Ok its telling you that the battery in zone three monitoring device (probably PIR) is now exhausted thus rendering it inactive.

When the battery is replaced and the signel restored,the fault should clear,

3.6v lithium (Tadiran TL-5902) lasts for years these.

e manno, May 2012

Thanks for all the help its displaying : Z3 low battery
Z3 INACTIVE

and I cannot set it aswell.

timbo, May 2012

OK,stick to one post here,it can get a little confusing if not.

You will probably find you cannot arm the system either,

press the `show ok`button and read the message,repeat the procedure untill you have read all the messages.

What do they say ?.

e manno, May 2012