Report "My friend has a dsc power series 433 home alarm. started playing up as in going off all the time. have changed battery in box but still playing up. they have never used a code to set and unset as they had remotes. was second hand and no manual. how do we reset it as we do not know any master code at all . oh and the remote batteries are dead too cldnt find the product hense the one on list sorry"