with the cover off and marigolds on, if you press the buttons on the pcb, what happens (i ask this as it may be as simple as the front facia panel is bent and the button actuators on this panel aren't making contact with the pcb buttons)
also check you haven't dislodged the 4 stripey telephone wires going into terminals 1, 2, 3, 4, ensure they are all secure
lastly, once you've fedback on the points above, and if we can't solve it, there may be an anti-tamper lockout on the central controller that has detected a fault and needs resetting for your flat - you'd have to contact the facility management co to complain that 'suddenly' your door ain't working :/
pictures....
re-reading your document > http://www.intercomsrus.com/handset%20pdf/GDX%20Audio%20Door%20Intercom%20Handset%20Data%20Sheet.pdf < can you describe what is and isn't working more clearly against the described operation - sounds/lights/buttons pressed
with the cover off and marigolds on, if you press the buttons on the pcb, what happens (i ask this as it may be as simple as the front facia panel is bent and the button actuators on this panel aren't making contact with the pcb buttons)
also check you haven't dislodged the 4 stripey telephone wires going into terminals 1, 2, 3, 4, ensure they are all secure
lastly, once you've fedback on the points above, and if we can't solve it, there may be an anti-tamper lockout on the central controller that has detected a fault and needs resetting for your flat - you'd have to contact the facility management co to complain that 'suddenly' your door ain't working :/