Texecom Premier 24 Part Set Fault?

[markash]

I installed the Premier 24 panel in Jan and have had no problems with the system apart from one niggling thing which I just can't work out.

I do a Part 3 set every evening when going to bed, the only omitted zone is the landing PIR. To set the alarm I usually just press 3 then PART then make my way up the stairs. Most of the time this works fine but occasionally when I get within range of the landing PIR it acts as if it

[kka]

the 3 then part option needs to be programmed in engineering, or else code - part - 3 - yes

sorry cannot be of any more help