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I have successfully replaced the battery. Last basic question I hope. How do I exit engineering mode?

Brilliant, thanks Pars.

Many thanks for that The Pars. I entered engineer mode and it did the trick. I have ordered a basic new battery from Amazon. If I leave the alarm in engineer mode will this prevent it from going off in the middle of the night?

Hi, The battery in our Securit 800L was last replaced 6 years ago and our alarm has started to sound when not set. It gives a tamper warning. I suspect it might need a new battery. My question is how can I open the case without the alarm sounding? Is there a code that I can enter into the...