[security master tp-800 pre wired alarm problems!]

Thanks everyone - it used to work fine but it must be YEARS old .... scrap heap might be the result after I've checked out Peter's comments about the bell/ siren .

Again thanks very much for your comments 

[security master tp-800 pre wired alarm problems!]

15 hours ago, PeterJames said:

It could be a number of things could be poor connections in the bell so t6he bell is not getting enough current, do you see corrosion on the terminals at the bell? It could be the bell is knackered, it could be the panel is knackered my money is on one of the first two 

Thanks  very much for advice Peter I'll take a look 

[security master tp-800 pre wired alarm problems!]

Sorry didn't mention my system is a Pre Wired Security Master

[security master tp-800 pre wired alarm problems!]

My system appears to function  fully but once the alarm goes off keying in the code will not stop the siren ? Ive tried changing the back up  batteries that has no effect Any ideas please