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Hi. We have a 20 year old wired alarm system which works well but the Guardtec 550 keypad display is going. How easy is it for a competent DIYer to replace the control unit for one bought on line please? The alarm company want to charge £550 but you can buy a new alarm keypad online for less...

Hi. I am fitting a new Hive and have what I hope will be a simple question :) I need to replace the existing control unit (which is hard wired to my Alpha boiler) with the Hive controller I can re-use the same wall plate which currently has blue going to the N terminal, brown going to the L...