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alarm system?

my challenger ap 28 system will not set alarm when i leave the house it keeps a two tone sound and 1 zone light comes on . I have tried resetting system have you any other ideas
roy, November 2014
Entry/exit fixed at zone 1 on them so you probably have duff door contacts.

e manno, November 2014
find and fix the fault on zone one

gts, November 2014
link Click here to see other fixes for Challenger AP28.