So the switch in that keypad isn't making contact, either the base isn't sitting flat enough or you havnt pushed the cable in so cores sit in neatly and so on, some times it can be the plugs in wall , tap them in slightly
Must be a few other things , I assume if you manually hold the tamper switch in it clears? I think it's a type of tab on the touch centre hold and and try and come out of engineers again
The standard keypad normally gives this issue as well but I have seen this on the touch centre
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