Custie86

Hi Guys/Gals. I installed a Honeywell Optima security alarm system the other day. The system tested okay, I have programmed the zones, Competed walk test, Tested siren, Tested strobe. The system sets but when entering the house and triggering the PIR, The panel sounds and then siren sounds but only for a couple of seconds to repeat about 15 seconds later. Tried everything in the manual to rectify but nothing seems to work. I will try Honeywell Customer services tomorrow but really stressed as to what it could be. Any help would be greatly appreciated.